"Theories of commitment, altruism, and reciprocity have been invoked to explain and describe behavior in public goods and social dilemma situations. Commitment has been used to explain behaviors like water conservation and voting. Altruism has been applied to explain contributions to charities...

Recommended contributions are often observed in fundraising campaigns for charitable and other public goods. We present an experiment investigating the impact of recommended contributions in a voluntary threshold public goods process. We find that when valuations for the public good are...