We study spatially differentiated competition between charities by partnering with two foodbanks in two neighboring cities to conduct a field experiment with roughly 350 donation appeals. We induce spatial differentiation by varying the observability of charities' location such that each donor...

Many public goods can be provided at different spatial levels. Evidence from social identity theory and in-group favoritism raises the possibility that where higher-level provision is more efficient, subjects' narrow concern for local outcomes (parochialism) could harm efficiency. Building on...

Randomized controlled trials remain underutilized in informing policy design, despite their potential. Moral objections to experimentation ("experiment aversion") have been proposed as an explanation. We present three studies with members of the general public and policy-makers that allow us to...