Update app.py

app.py

@@ -486,21 +486,16 @@ def plot_allocation_trends(df, group_by_column, top_n=10):
     return fig
 
 def format_market_value(value):
-    """
-    Formats a market value into billions, millions, or thousands with appropriate units.
-    Args:
-        value (float): Market value in absolute terms.
-    Returns:
-        str: Formatted market value as a string with units.
-    """
-    if value >= 1e9:
-        return f"{value / 1e9:.1f}B"
-    elif value >= 1e6:
-        return f"{value / 1e6:.1f}M"
-    elif value >= 1e3:
-        return f"{value / 1e3:.1f}K"
+    sign = "-" if value < 0 else ""
+    abs_value = abs(value)
+    if abs_value >= 1e9:
+        return f"{sign}{abs_value/1e9:.1f}B"
+    elif abs_value >= 1e6:
+        return f"{sign}{abs_value/1e6:.1f}M"
+    elif abs_value >= 1e3:
+        return f"{sign}{abs_value/1e3:.1f}K"
     else:
-        return f"{value:.1f}"
+        return f"{sign}{abs_value:.1f}"
 
 # Function for Page 3: Investor Performance
 def page3():