Why do people in rich countries not transfer more of their income to people in the world's poorest countries? To study this question and the relative importance of needs, entitlements, and nationality in people's social preferences, we conducted a real effort fairness experiment where people in...

In many important economic settings, limited information makes it impossible for decision makers to ensure that each individual gets what he or she deserves. Decision makers are then faced with the trade-off between giving some individuals more than they deserve, false positives, and giving some...