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: [5, 5, 11].
- Round 2: Your choice: [12], the other players' choices: [0, 5, 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]).


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 4 round(s). Here is the play history:
- Round 1: Your choice: [15], the other players' choices: [5, 4, 20].
- Round 2: Your choice: [20], the other players' choices: [5, 10, 20].
- Round 3: Your choice: [5], the other players' choices: [10, 0, 5].
- Round 4: Your choice: [11], the other players' choices: [10, 1, 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: [5, 9, 6].

## 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: [1], the other players' choices: [8, 8, 12].
- Round 2: Your choice: [2], the other players' choices: [7, 7, 5].
- Round 3: Your choice: [0], the other players' choices: [4, 4, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [20], the other players' choices: [10, 10, 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: [10, 0, 10].
- Round 2: Your choice: [8], the other players' choices: [13, 10, 20].
- Round 3: Your choice: [12], the other players' choices: [20, 20, 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 3 round(s). Here is the play history:
- Round 1: Your choice: [0], the other players' choices: [0, 10, 5].
- Round 2: Your choice: [0], the other players' choices: [0, 5, 6].
- Round 3: Your choice: [0], the other players' choices: [0, 6, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [20, 5, 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]).


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: [11], the other players' choices: [10, 10, 10].
- Round 2: Your choice: [12], the other players' choices: [15, 10, 1].
- Round 3: Your choice: [13], the other players' choices: [10, 10, 2].

## 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: [5], the other players' choices: [9, 12, 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: [5], the other players' choices: [2, 0, 1].
- Round 2: Your choice: [10], the other players' choices: [1, 0, 1].
- Round 3: Your choice: [10], the other players' choices: [1, 0, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [8], the other players' choices: [0, 0, 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]).


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: [0], the other players' choices: [8, 1, 0].
- Round 2: Your choice: [0], the other players' choices: [0, 0, 0].
- Round 3: Your choice: [0], the other players' choices: [8, 2, 0].
- Round 4: Your choice: [0], the other players' choices: [2, 1, 2].
- Round 5: Your choice: [0], the other players' choices: [2, 1, 0].
- Round 6: Your choice: [0], the other players' choices: [2, 0, 0].
- Round 7: Your choice: [0], the other players' choices: [2, 1, 0].
- Round 8: Your choice: [1], the other players' choices: [0, 2, 0].
- Round 9: Your choice: [1], the other players' choices: [3, 0, 1].

## 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 3 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [20, 20, 9].
- Round 2: Your choice: [15], the other players' choices: [20, 20, 16].
- Round 3: Your choice: [20], the other players' choices: [20, 20, 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 3 round(s). Here is the play history:
- Round 1: Your choice: [18], the other players' choices: [15, 18, 12].
- Round 2: Your choice: [20], the other players' choices: [19, 15, 15].
- Round 3: Your choice: [18], the other players' choices: [20, 17, 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 3 round(s). Here is the play history:
- Round 1: Your choice: [20], the other players' choices: [5, 14, 10].
- Round 2: Your choice: [20], the other players' choices: [4, 6, 10].
- Round 3: Your choice: [20], the other players' choices: [3, 16, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [6], 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 2 round(s). Here is the play history:
- Round 1: Your choice: [20], the other players' choices: [10, 7, 11].
- Round 2: Your choice: [7], the other players' choices: [12, 13, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [12, 7, 4].

## 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: [8], the other players' choices: [5, 5, 12].
- Round 2: Your choice: [10], the other players' choices: [10, 10, 12].
- Round 3: Your choice: [20], the other players' choices: [10, 15, 13].

## 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: [6], the other players' choices: [3, 10, 20].
- Round 2: Your choice: [7], the other players' choices: [3, 10, 14].
- Round 3: Your choice: [10], the other players' choices: [7, 10, 13].

## 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: [0], the other players' choices: [10, 13, 14].
- Round 2: Your choice: [10], the other players' choices: [11, 14, 15].
- Round 3: Your choice: [0], the other players' choices: [15, 15, 14].
- Round 4: Your choice: [20], the other players' choices: [3, 16, 10].
- Round 5: Your choice: [16], the other players' choices: [20, 17, 8].

## 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: [10], the other players' choices: [13, 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 2 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [6, 10, 20].
- Round 2: Your choice: [10], the other players' choices: [10, 8, 18].

## 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: [10], the other players' choices: [15, 19, 14].
- Round 2: Your choice: [10], the other players' choices: [15, 8, 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 3 round(s). Here is the play history:
- Round 1: Your choice: [20], the other players' choices: [10, 10, 20].
- Round 2: Your choice: [20], the other players' choices: [20, 20, 20].
- Round 3: Your choice: [20], the other players' choices: [20, 20, 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 4 round(s). Here is the play history:
- Round 1: Your choice: [3], the other players' choices: [5, 4, 7].
- Round 2: Your choice: [3], the other players' choices: [2, 3, 8].
- Round 3: Your choice: [4], the other players' choices: [14, 10, 5].
- Round 4: Your choice: [4], the other players' choices: [1, 0, 3].

## 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: [15], the other players' choices: [4, 4, 0].
- Round 2: Your choice: [15], the other players' choices: [1, 3, 0].
- Round 3: Your choice: [0], the other players' choices: [15, 5, 0].
- Round 4: Your choice: [10], the other players' choices: [4, 4, 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 2 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [7, 9, 9].
- Round 2: Your choice: [5], the other players' choices: [7, 7, 7].

## 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: [10, 5, 5].
- Round 2: Your choice: [6], the other players' choices: [5, 10, 5].
- Round 3: Your choice: [8], the other players' choices: [5, 0, 0].
- Round 4: Your choice: [3], the other players' choices: [2, 5, 2].

## 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: [10, 7, 10].
- Round 2: Your choice: [14], the other players' choices: [10, 10, 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 4 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [7, 11, 10].
- Round 2: Your choice: [10], the other players' choices: [13, 12, 13].
- Round 3: Your choice: [8], the other players' choices: [10, 13, 15].
- Round 4: Your choice: [11], the other players' choices: [20, 14, 20].

## 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: [12], the other players' choices: [9, 12, 9].
- Round 2: Your choice: [8], the other players' choices: [11, 10, 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 4 round(s). Here is the play history:
- Round 1: Your choice: [20], the other players' choices: [5, 8, 4].
- Round 2: Your choice: [20], the other players' choices: [5, 7, 3].
- Round 3: Your choice: [20], the other players' choices: [5, 6, 5].
- Round 4: Your choice: [20], the other players' choices: [4, 3, 4].

## 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: [20], the other players' choices: [5, 10, 8].
- Round 2: Your choice: [0], the other players' choices: [10, 10, 11].
- Round 3: Your choice: [13], the other players' choices: [10, 15, 6].
- Round 4: Your choice: [14], the other players' choices: [5, 15, 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 4 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [6, 15, 7].
- Round 2: Your choice: [9], the other players' choices: [8, 17, 10].
- Round 3: Your choice: [9], the other players' choices: [0, 18, 12].
- Round 4: Your choice: [9], the other players' choices: [20, 0, 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 3 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [20, 7, 10].
- Round 2: Your choice: [6], the other players' choices: [15, 3, 12].
- Round 3: Your choice: [1], the other players' choices: [20, 5, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [13, 10, 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: [8, 7, 7].
- Round 2: Your choice: [14], the other players' choices: [8, 8, 8].
- Round 3: Your choice: [20], the other players' choices: [10, 10, 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 2 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [0, 0, 1].
- Round 2: Your choice: [0], the other players' choices: [0, 0, 0].

## 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 14 round(s). Here is the play history:
- Round 1: Your choice: [1], the other players' choices: [15, 5, 5].
- Round 2: Your choice: [1], the other players' choices: [18, 20, 10].
- Round 3: Your choice: [2], the other players' choices: [20, 10, 8].
- Round 4: Your choice: [1], the other players' choices: [20, 10, 10].
- Round 5: Your choice: [0], the other players' choices: [20, 10, 5].
- Round 6: Your choice: [1], the other players' choices: [1, 20, 8].
- Round 7: Your choice: [2], the other players' choices: [1, 0, 8].
- Round 8: Your choice: [0], the other players' choices: [10, 10, 5].
- Round 9: Your choice: [1], the other players' choices: [5, 10, 20].
- Round 10: Your choice: [1], the other players' choices: [15, 10, 7].
- Round 11: Your choice: [3], the other players' choices: [10, 12, 8].
- Round 12: Your choice: [3], the other players' choices: [10, 10, 6].
- Round 13: Your choice: [4], the other players' choices: [1, 10, 15].
- Round 14: Your choice: [5], the other players' choices: [15, 5, 8].

## Your Choice
Now in Round 15, 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: [5], the other players' choices: [5, 4, 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 8 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [15, 8, 5].
- Round 2: Your choice: [7], the other players' choices: [9, 10, 10].
- Round 3: Your choice: [1], the other players' choices: [2, 7, 14].
- Round 4: Your choice: [10], the other players' choices: [7, 10, 5].
- Round 5: Your choice: [2], the other players' choices: [12, 12, 20].
- Round 6: Your choice: [10], the other players' choices: [7, 16, 16].
- Round 7: Your choice: [6], the other players' choices: [3, 20, 20].
- Round 8: Your choice: [1], the other players' choices: [0, 6, 7].

## Your Choice
Now in Round 9, 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: [6], the other players' choices: [8, 5, 5].
- Round 2: Your choice: [10], the other players' choices: [8, 4, 6].
- Round 3: Your choice: [2], the other players' choices: [10, 10, 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: [0], the other players' choices: [10, 5, 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 7 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [10, 14, 10].
- Round 2: Your choice: [11], the other players' choices: [8, 15, 7].
- Round 3: Your choice: [10], the other players' choices: [8, 15, 5].
- Round 4: Your choice: [10], the other players' choices: [8, 20, 5].
- Round 5: Your choice: [10], the other players' choices: [8, 17, 3].
- Round 6: Your choice: [10], the other players' choices: [10, 0, 10].
- Round 7: Your choice: [20], the other players' choices: [5, 2, 0].

## 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 1 round(s). Here is the play history:
- Round 1: Your choice: [10], the other players' choices: [10, 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]).


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: [8, 10, 10].
- Round 2: Your choice: [10], the other players' choices: [10, 9, 9].
- Round 3: Your choice: [9], the other players' choices: [9, 9, 9].
- Round 4: Your choice: [10], the other players' choices: [9, 9, 9].

## 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: [11], the other players' choices: [2, 4, 4].
- Round 2: Your choice: [9], the other players' choices: [3, 5, 4].
- Round 3: Your choice: [8], the other players' choices: [4, 0, 4].
- Round 4: Your choice: [9], the other players' choices: [0, 7, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [11], the other players' choices: [20, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [3], the other players' choices: [5, 7, 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 4 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [8, 7, 7].
- Round 2: Your choice: [10], the other players' choices: [6, 6, 6].
- Round 3: Your choice: [15], the other players' choices: [7, 7, 7].
- Round 4: Your choice: [20], the other players' choices: [9, 9, 9].

## 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: [14], the other players' choices: [2, 4, 10].
- Round 2: Your choice: [9], the other players' choices: [4, 5, 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 2 round(s). Here is the play history:
- Round 1: Your choice: [6], the other players' choices: [15, 10, 18].
- Round 2: Your choice: [8], the other players' choices: [20, 10, 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: [20], the other players' choices: [5, 0, 3].
- Round 2: Your choice: [20], the other players' choices: [3, 0, 6].
- Round 3: Your choice: [20], the other players' choices: [10, 0, 2].

## 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: [0], the other players' choices: [20, 10, 19].
- Round 2: Your choice: [0], the other players' choices: [20, 12, 17].
- Round 3: Your choice: [0], the other players' choices: [19, 12, 19].

## 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: [6], the other players' choices: [8, 10, 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 2 round(s). Here is the play history:
- Round 1: Your choice: [8], the other players' choices: [1, 18, 5].
- Round 2: Your choice: [9], the other players' choices: [2, 14, 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 2 round(s). Here is the play history:
- Round 1: Your choice: [2], the other players' choices: [5, 17, 1].
- Round 2: Your choice: [5], the other players' choices: [8, 18, 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 3 round(s). Here is the play history:
- Round 1: Your choice: [5], the other players' choices: [6, 18, 5].
- Round 2: Your choice: [5], the other players' choices: [10, 19, 5].
- Round 3: Your choice: [5], the other players' choices: [8, 7, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [7], the other players' choices: [2, 0, 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 2 round(s). Here is the play history:
- Round 1: Your choice: [0], the other players' choices: [0, 13, 12].
- Round 2: Your choice: [20], the other players' choices: [0, 4, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [20], the other players' choices: [8, 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 2 round(s). Here is the play history:
- Round 1: Your choice: [20], the other players' choices: [0, 10, 10].
- Round 2: Your choice: [20], the other players' choices: [10, 8, 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: [18], the other players' choices: [10, 8, 11].
- Round 2: Your choice: [18], the other players' choices: [12, 13, 12].
- Round 3: Your choice: [4], the other players' choices: [14, 14, 14].
- Round 4: Your choice: [6], the other players' choices: [10, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [11], the other players' choices: [14, 10, 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: [6], the other players' choices: [2, 10, 8].
- Round 2: Your choice: [12], the other players' choices: [6, 10, 10].
- Round 3: Your choice: [2], the other players' choices: [14, 10, 4].

## 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: [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: [8], the other players' choices: [20, 0, 7].
- Round 2: Your choice: [5], the other players' choices: [20, 0, 8].
- Round 3: Your choice: [7], the other players' choices: [20, 0, 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: [11], the other players' choices: [10, 15, 6].
- Round 2: Your choice: [16], the other players' choices: [12, 13, 13].
- Round 3: Your choice: [10], the other players' choices: [12, 16, 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 1 round(s). Here is the play history:
- Round 1: Your choice: [0], the other players' choices: [5, 10, 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]).


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: [6, 10, 7].
- Round 2: Your choice: [0], the other players' choices: [7, 15, 10].
- Round 3: Your choice: [0], the other players' choices: [8, 11, 8].
- Round 4: Your choice: [0], the other players' choices: [7, 10, 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: [5], the other players' choices: [0, 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]).