Christmas is when people are expected to act selflessly for the well-being of others, but are people actually more altruistic at this time of the year? Responding to this question poses a challenge because of the confounding factors of charitable tax breaks, reciprocity motives, direct social...

This paper characterizes optimal nonlinear income taxation of individuals who exhibit social preferences. If individuals exhibit equity concerns, above and beyond the government's social welfare criterion, how is the shape of the marginal tax schedule impacted? In particular, I consider...

Social preferences such as altruism, reciprocity, intrinsic motivation and a desire to uphold ethical norms are essential to good government, often facilitating socially desirable allocations that would be unattainable by incentives that appeal solely to self-interest. But experimental and other...

Laws and policies designed to harness self-regarding preferences to public ends may fail when they compromise the beneficial effects of pro-social preferences. Experimental evidence indicates that incentives that appeal to self interest may reduce the salience of intrinsic motivation,...