This paper examines social comparisons and pro-social behavior through a field experiment at the University of Zurich. The study tests the hypothesis that people are more likely to contribute to social funds if they see that others are also contributing. The experiment involved 2500 randomly selected students who were informed about the average contribution rate of their peers, either a high (64%) or a low (46%) rate. The results show that people are indeed more likely to contribute when they see that many others are doing so, but this effect is limited to certain types of individuals. Those who are uncertain about their contribution decisions are more sensitive to the behavior of others, while those who consistently contribute or do not contribute are less influenced by the actions of others. The study provides evidence for conditional cooperation, where individuals' behavior is positively correlated with the average behavior of the group, and highlights the importance of social comparisons in understanding pro-social behavior.This paper examines social comparisons and pro-social behavior through a field experiment at the University of Zurich. The study tests the hypothesis that people are more likely to contribute to social funds if they see that others are also contributing. The experiment involved 2500 randomly selected students who were informed about the average contribution rate of their peers, either a high (64%) or a low (46%) rate. The results show that people are indeed more likely to contribute when they see that many others are doing so, but this effect is limited to certain types of individuals. Those who are uncertain about their contribution decisions are more sensitive to the behavior of others, while those who consistently contribute or do not contribute are less influenced by the actions of others. The study provides evidence for conditional cooperation, where individuals' behavior is positively correlated with the average behavior of the group, and highlights the importance of social comparisons in understanding pro-social behavior.