Charities frequently rely on professional solicitors whose commissions exceed half of total donations. To understand this practice, we propose a principal-agent model in which the charity optimally offers a higher commission to a more “efficient” solicitor, raising the price of giving...

In light of recent evidence, we develop a theory of charitable giving in which donors feel social pressure from a direct solicitation. We show that equilibrium donations are concentrated around a social norm: donors below the norm increase giving while those above the norm reduce it. Despite a...