majors and non-majors are less likely to contribute than comparable men. -- Altruism ; public goods …

"Theories abound for why individuals give to charity. We conduct a field experiment with donors to a Yale University … theories, we conduct a laboratory experiment with undergraduates, and find no evidence to support the alternative, altruistic …

"What triggers giving? We explore this in a randomized natural field experiment during the Salvation Army's annual … views of altruism, such as inequity aversion, and instead highlight the importance of social cues and psychological features … of the giver-receiver interaction. We argue that avoidance could evidence a lack of altruism or self-control strategy to …