We examine optimal incentives for charitable giving with a large-scale field experiment involving 26 charities and over 112,000 unique individuals. The price of giving is varied by offering a fixed match if the donation meets a threshold amount (e.g. "give at least $25 and the charity receives a...

Donating to charity requires time, effort and attention. If the nuisance costs to give are perceived to be large, charities may lose out on donations. We develop a non-parametric test for the presence of these costs and conduct a large-scale field experiment on giving to show that nuisance costs...