The paper examines gender differences in altruism through a modified dictator game with varying incomes and prices. The results indicate that the question of which sex is more altruistic has a complex answer. When altruism is expensive, women are more generous, while when it is cheap, men are more altruistic. This suggests that the "demand curves for altruism" cross, and men are more responsive to price changes. Men are more likely to be either perfectly selfish or perfectly selfless, whereas women tend to be "equalitarians" who prefer to share evenly. The findings unify previous mixed results in other studies and have implications for economic behavior, experimental methodology, and real-world applications such as charitable giving and restaurant tipping.The paper examines gender differences in altruism through a modified dictator game with varying incomes and prices. The results indicate that the question of which sex is more altruistic has a complex answer. When altruism is expensive, women are more generous, while when it is cheap, men are more altruistic. This suggests that the "demand curves for altruism" cross, and men are more responsive to price changes. Men are more likely to be either perfectly selfish or perfectly selfless, whereas women tend to be "equalitarians" who prefer to share evenly. The findings unify previous mixed results in other studies and have implications for economic behavior, experimental methodology, and real-world applications such as charitable giving and restaurant tipping.