In settings with uncertainty, tension exists between ex ante and ex post notions of fairness (e.g., equal opportunity versus equal outcomes). In a laboratory experiment, the most common behavioral pattern is for subjects to select the ex ante fair alternative ex ante, and switch to the ex post...

We motivate this paper with a puzzle. When we asked subjects to give five dollars to charity today, about 30 percent agree, but when the donation would instead be paid in one week, giving increases by 50 percent. The puzzle is that received models of self-control cannot explain this...

The growing concentration of resources among the rich has re-ignited a discussion about whether the rich are more selfish than others. While many recent studies show the rich behaving less pro-socially, endogeneity and selection problems prevent safe inferences about differences in social...