Several recent laboratory experiments have shown that the use of explicit incentives - such as conditional rewards and punishment - entail considerable “hidden” costs. The costs are hidden in the sense that they escape our attention if our reasoning is based on the assumption that people are...

Theory commonly posits agents who care both for the level of provision of a public good and the extent to which they personally contribute to the cause. Simply put, agents feel some "warm glow" from the donations they make. I discuss a fundraiser devised to exogenously vary the incentive to give...

Calling to thank donors is a key fundraising strategy in the non-profit sector. Yet the effectiveness of these calls remains untested. We report on field experiments with public television stations and a national non-profit in which new donors were randomized to receive a thank-you call or not....