One important determinant of voluntary contributions to public goods is the value of the public good relative to that of the forgone private good. Isaac, Walker and Thomas (1984) formalized this relation in the Marginal Per Capita Return (MPCR) and demonstrated its influence on the provision of...

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...