Donor Advised Funds (DAFs) are now a major source of charitable donations in the US, responsible for 1 in 10 dollars donated to charity in 2015. In 2016, Fidelity Charitable, whose only mission is to provide DAFS, became the largest charity in the US. Paradoxically, most people have never heard...

We use structural estimates of time preferences to customize incentives for polio vaccinators in Lahore, Pakistan. We measure time preferences using intertemporal allocations of effort, and derive the mapping between these structural estimates and individually optimized incentives. We evaluate...

We report experimental results for a twice-played prisoners' dilemma in which the players can choose the allocation of the stakes across the two periods. Our point of departure is the assumption that some (but not all) people are principled to "do the right thing," or cooperate, as long as their...

We study whether actions are justified by beliefs, as is usually assumed, or whether beliefs are justified by actions. In our experiment, subjects participate in a trust game, after which they have an opportunity to state their beliefs about their opponent's actions. Subsequently, subjects...

If being asked to give to charity stimulates an emotional response, like empathy, that makes giving difficult to resist, a natural self-control mechanism might be to avoid being asked in the first place. We replicate a result from a field experiment that points to the role of empathy in giving....

We model contests with a fixed proportion of prizes, such as a grading curve, as all-pay auctions where higher effort weakly increases the likelihood of a prize. We find theoretical predictions for the effect of contest size on effort and test our predictions in a laboratory experiment that...

Eliciting time preferences has become an important component of both laboratory and field experiments, yet there is no consensus as how to best measure discounting. We examine the predictive validity of two recent, simple, easily administered, and individually successful elicitation tools:...

We present new evidence on the effect of grants on charities' incomes. We employ a novel identification strategy, focusing on charities that applied for lottery grant funding and comparing outcomes for successful and unsuccessful applicants. Overall, grants do not crowd out other income but the...

If people get joy from giving, then why might they avoid fundraisers? We explore this in a randomized natural field experiment during the Salvation Army's annual campaign. The familiar bell-ringers were placed at one or both of two main entrances to a supermarket, making the ask for a charitable...

Using data from charitable organizations in the US, authors have established that government grants to charities largely crowd out giving from other sources, but that this reduction is due mostly to reduced fundraising activities of the charity itself. We use much more detailed data from over...