In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [12, 10, 10].
- Round 2: Your choice: [5], the other players' choices: [12, 10, 9].
- Round 3: Your choice: [10], the other players' choices: [14, 5, 8].
- Round 4: Your choice: [5], the other players' choices: [20, 0, 7].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


System: You are a player who is playing an economics game.

In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [0, 3, 10].
- Round 2: Your choice: [8], the other players' choices: [10, 0, 8].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [7, 12, 10].
- Round 2: Your choice: [10], the other players' choices: [9, 13, 12].
- Round 3: Your choice: [15], the other players' choices: [6, 10, 14].
- Round 4: Your choice: [16], the other players' choices: [2, 15, 7].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [0], the other players' choices: [9, 3, 10].
- Round 2: Your choice: [1], the other players' choices: [10, 1, 10].
- Round 3: Your choice: [2], the other players' choices: [16, 9, 10].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [10, 10, 8].
- Round 2: Your choice: [5], the other players' choices: [10, 20, 8].
- Round 3: Your choice: [5], the other players' choices: [10, 5, 8].
- Round 4: Your choice: [5], the other players' choices: [10, 10, 8].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [10, 20, 10].
- Round 2: Your choice: [8], the other players' choices: [15, 0, 8].
- Round 3: Your choice: [20], the other players' choices: [5, 15, 6].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [8], the other players' choices: [0, 11, 10].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [15], the other players' choices: [7, 11, 13].
- Round 2: Your choice: [20], the other players' choices: [13, 11, 11].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [0], the other players' choices: [2, 4, 12].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [3], the other players' choices: [10, 8, 3].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [20, 15, 10].
- Round 2: Your choice: [10], the other players' choices: [20, 20, 20].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [3], the other players' choices: [5, 8, 9].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [7, 7, 12].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [19, 10, 7].
- Round 2: Your choice: [5], the other players' choices: [5, 10, 10].
- Round 3: Your choice: [10], the other players' choices: [10, 11, 5].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [9], the other players' choices: [10, 20, 10].
- Round 2: Your choice: [10], the other players' choices: [12, 20, 10].
- Round 3: Your choice: [9], the other players' choices: [14, 0, 12].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [7, 7, 12].
- Round 2: Your choice: [16], the other players' choices: [9, 9, 8].
- Round 3: Your choice: [15], the other players' choices: [11, 11, 11].
- Round 4: Your choice: [20], the other players' choices: [12, 12, 12].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [16], the other players' choices: [8, 8, 9].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [10, 10, 10].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [6, 8, 2].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [8, 13, 13].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [10, 9, 10].
- Round 2: Your choice: [10], the other players' choices: [20, 5, 10].
- Round 3: Your choice: [10], the other players' choices: [12, 15, 8].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 5 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [8, 10, 10].
- Round 2: Your choice: [10], the other players' choices: [10, 5, 15].
- Round 3: Your choice: [15], the other players' choices: [12, 18, 20].
- Round 4: Your choice: [15], the other players' choices: [14, 18, 5].
- Round 5: Your choice: [17], the other players' choices: [10, 13, 12].

## Your Choice
Now in Round 6, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [8], the other players' choices: [13, 1, 15].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [9], the other players' choices: [20, 0, 7].
- Round 2: Your choice: [10], the other players' choices: [20, 0, 5].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [20], the other players' choices: [8, 20, 20].
- Round 2: Your choice: [20], the other players' choices: [8, 20, 20].
- Round 3: Your choice: [20], the other players' choices: [8, 20, 15].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [6, 5, 4].
- Round 2: Your choice: [8], the other players' choices: [10, 12, 4].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [0], the other players' choices: [10, 20, 5].
- Round 2: Your choice: [5], the other players' choices: [12, 20, 5].
- Round 3: Your choice: [10], the other players' choices: [10, 20, 5].
- Round 4: Your choice: [15], the other players' choices: [12, 10, 10].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 7 round(s). Here is the play history:
- Round 1: Your choice: [15], the other players' choices: [0, 10, 10].
- Round 2: Your choice: [18], the other players' choices: [0, 10, 0].
- Round 3: Your choice: [10], the other players' choices: [0, 0, 6].
- Round 4: Your choice: [12], the other players' choices: [0, 5, 1].
- Round 5: Your choice: [5], the other players' choices: [0, 10, 2].
- Round 6: Your choice: [2], the other players' choices: [0, 5, 0].
- Round 7: Your choice: [6], the other players' choices: [0, 5, 1].

## Your Choice
Now in Round 8, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [15], the other players' choices: [6, 0, 8].
- Round 2: Your choice: [15], the other players' choices: [10, 0, 10].
- Round 3: Your choice: [10], the other players' choices: [12, 0, 15].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [13, 20, 10].
- Round 2: Your choice: [15], the other players' choices: [13, 0, 12].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [0], the other players' choices: [5, 10, 7].
- Round 2: Your choice: [0], the other players' choices: [20, 6, 8].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [9, 10, 12].
- Round 2: Your choice: [9], the other players' choices: [9, 8, 8].
- Round 3: Your choice: [6], the other players' choices: [8, 8, 8].
- Round 4: Your choice: [10], the other players' choices: [7, 7, 7].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [6], the other players' choices: [13, 10, 3].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [10, 5, 7].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [20], the other players' choices: [20, 20, 20].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [15], the other players' choices: [0, 6, 9].
- Round 2: Your choice: [10], the other players' choices: [0, 7, 10].
- Round 3: Your choice: [8], the other players' choices: [0, 10, 5].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [6, 10, 1].
- Round 2: Your choice: [10], the other players' choices: [7, 8, 1].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [0], the other players' choices: [12, 7, 8].
- Round 2: Your choice: [5], the other players' choices: [5, 6, 6].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [7], the other players' choices: [5, 5, 5].
- Round 2: Your choice: [8], the other players' choices: [3, 8, 10].
- Round 3: Your choice: [9], the other players' choices: [5, 5, 5].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [15], the other players' choices: [3, 10, 20].
- Round 2: Your choice: [12], the other players' choices: [9, 20, 20].
- Round 3: Your choice: [15], the other players' choices: [11, 8, 20].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [10, 20, 10].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [7, 10, 8].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [11], the other players' choices: [10, 5, 10].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [19], the other players' choices: [10, 7, 6].
- Round 2: Your choice: [16], the other players' choices: [10, 8, 14].
- Round 3: Your choice: [14], the other players' choices: [10, 10, 16].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [15], the other players' choices: [8, 12, 9].
- Round 2: Your choice: [20], the other players' choices: [12, 10, 11].
- Round 3: Your choice: [15], the other players' choices: [13, 14, 14].
- Round 4: Your choice: [17], the other players' choices: [14, 14, 14].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [8, 8, 7].
- Round 2: Your choice: [5], the other players' choices: [9, 7, 10].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [1, 5, 10].
- Round 2: Your choice: [10], the other players' choices: [0, 8, 20].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [11, 8, 13].
- Round 2: Your choice: [3], the other players' choices: [8, 9, 8].
- Round 3: Your choice: [7], the other players' choices: [6, 6, 6].
- Round 4: Your choice: [6], the other players' choices: [6, 6, 6].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [20, 20, 8].
- Round 2: Your choice: [10], the other players' choices: [20, 20, 16].
- Round 3: Your choice: [8], the other players' choices: [20, 20, 16].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [10, 11, 13].
- Round 2: Your choice: [10], the other players' choices: [9, 9, 8].
- Round 3: Your choice: [5], the other players' choices: [9, 9, 9].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [4], the other players' choices: [7, 3, 0].
- Round 2: Your choice: [2], the other players' choices: [10, 2, 0].
- Round 3: Your choice: [1], the other players' choices: [5, 7, 0].
- Round 4: Your choice: [0], the other players' choices: [20, 11, 0].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [7, 12, 8].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [20], the other players' choices: [20, 20, 20].
- Round 2: Your choice: [20], the other players' choices: [20, 20, 20].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [8, 8, 7].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [16], the other players' choices: [9, 9, 7].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [12, 10, 10].
- Round 2: Your choice: [11], the other players' choices: [9, 12, 9].
- Round 3: Your choice: [7], the other players' choices: [13, 12, 10].
- Round 4: Your choice: [10], the other players' choices: [10, 11, 10].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [20, 9, 12].
- Round 2: Your choice: [10], the other players' choices: [20, 14, 13].
- Round 3: Your choice: [10], the other players' choices: [20, 14, 14].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [3], the other players' choices: [6, 5, 0].
- Round 2: Your choice: [7], the other players' choices: [7, 0, 7].
- Round 3: Your choice: [1], the other players' choices: [14, 5, 0].
- Round 4: Your choice: [5], the other players' choices: [8, 0, 5].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [6], the other players' choices: [5, 6, 10].
- Round 2: Your choice: [14], the other players' choices: [10, 4, 12].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [8, 10, 0].
- Round 2: Your choice: [10], the other players' choices: [7, 10, 0].
- Round 3: Your choice: [11], the other players' choices: [7, 10, 0].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [13, 10, 13].
- Round 2: Your choice: [0], the other players' choices: [11, 12, 11].
- Round 3: Your choice: [20], the other players' choices: [7, 7, 7].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [4], the other players' choices: [0, 2, 12].
- Round 2: Your choice: [3], the other players' choices: [10, 3, 2].
- Round 3: Your choice: [2], the other players' choices: [13, 2, 5].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [10, 10, 10].
- Round 2: Your choice: [10], the other players' choices: [20, 8, 10].
- Round 3: Your choice: [15], the other players' choices: [5, 5, 15].
- Round 4: Your choice: [20], the other players' choices: [5, 15, 1].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [6, 7, 10].
- Round 2: Your choice: [7], the other players' choices: [5, 8, 10].
- Round 3: Your choice: [10], the other players' choices: [4, 11, 11].
- Round 4: Your choice: [8], the other players' choices: [5, 9, 13].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [7], the other players' choices: [16, 10, 8].
- Round 2: Your choice: [8], the other players' choices: [17, 20, 10].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [18], the other players' choices: [5, 12, 15].
- Round 2: Your choice: [20], the other players' choices: [10, 15, 15].
- Round 3: Your choice: [18], the other players' choices: [12, 15, 18].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 9 round(s). Here is the play history:
- Round 1: Your choice: [2], the other players' choices: [20, 0, 10].
- Round 2: Your choice: [3], the other players' choices: [0, 0, 10].
- Round 3: Your choice: [3], the other players' choices: [20, 0, 10].
- Round 4: Your choice: [0], the other players' choices: [10, 10, 0].
- Round 5: Your choice: [1], the other players' choices: [5, 0, 10].
- Round 6: Your choice: [3], the other players' choices: [0, 10, 3].
- Round 7: Your choice: [2], the other players' choices: [9, 0, 10].
- Round 8: Your choice: [7], the other players' choices: [3, 0, 10].
- Round 9: Your choice: [0], the other players' choices: [4, 10, 0].

## Your Choice
Now in Round 10, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 2 round(s). Here is the play history:
- Round 1: Your choice: [4], the other players' choices: [15, 10, 15].
- Round 2: Your choice: [3], the other players' choices: [20, 12, 20].

## Your Choice
Now in Round 3, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [12], the other players' choices: [2, 5, 12].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 6 round(s). Here is the play history:
- Round 1: Your choice: [3], the other players' choices: [3, 3, 8].
- Round 2: Your choice: [0], the other players' choices: [5, 0, 5].
- Round 3: Your choice: [1], the other players' choices: [6, 5, 6].
- Round 4: Your choice: [6], the other players' choices: [8, 1, 8].
- Round 5: Your choice: [5], the other players' choices: [3, 5, 7].
- Round 6: Your choice: [3], the other players' choices: [7, 5, 10].

## Your Choice
Now in Round 7, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [12], the other players' choices: [20, 4, 5].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 3 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [6, 10, 20].
- Round 2: Your choice: [7], the other players' choices: [8, 10, 16].
- Round 3: Your choice: [4], the other players' choices: [6, 10, 16].

## Your Choice
Now in Round 4, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 4 round(s). Here is the play history:
- Round 1: Your choice: [9], the other players' choices: [0, 5, 15].
- Round 2: Your choice: [10], the other players' choices: [5, 4, 13].
- Round 3: Your choice: [13], the other players' choices: [5, 2, 16].
- Round 4: Your choice: [12], the other players' choices: [5, 0, 17].

## Your Choice
Now in Round 5, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).


In this public good game, you and 3 others will choose how much to contribute towards a water cleaning project. Each of you gets $20 per round to contribute between $0 and $20. The project has a 50% return rate. Your payoff relies on both your and others' contributions. Everyone benefits from the group's total contribution. Your payoff in each round equals the amount you didn't contribute (endowment - contribution) plus everyone's benefit (total contributions * 50% return rate). Here are two examples to calculate your payoff.
Example one: You contributed $12; total group contributions were $20
Your Payoff = ($20-$12) + $20*50% = $18
Example two: You contributed $12; total group contributions were $30
Your Payoff = ($20-$12) + $30*50% = $23
We will play a total of 3 rounds, in the first round, how much of the $20 would you like to contribute? Please give a concrete number and highlight it with [] (e.g., [x]).

## Play History
In this session, you have already played 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [20, 20, 0].

## Your Choice
Now in Round 2, what would you choose? Please give only one concrete choice and
highlight the number with [] (such as [$x]).