We test how donors respond to new information about a charity's effectiveness. Freedom from Hunger implemented a test … that highlights two predictions. First, larger gift amounts, holding education and income constant, is a proxy for altruism …). Second, those motivated by altruism will respond positively to appeals based on evidence, whereas those motivated by warm …

motivated only by pure altruism will work at a relatively high wage for the for-profit firm and then make charitable … sensitive to warm glow (“impure altruism”) depends on her income level. While the presence of “warm glow” feelings would seem to … clearly benefit charitable organizations, we show that impure altruism can create distortions in labor market choices. In some …