The obvious discrepancy between the predictions of the standard model of private provision of public goods and empirical indications have led many economists to search for alternative explanations of the phenomenon of voluntary contributions. Whilst concentrating on models of donor motivation,...

Collective Goods, Voluntary Contributions, and Intermediation: A Literature Survey -- A Theoretical Approach to Strategic Donor-Fundraiser Interaction -- An Empirical Investigation of Donor-Fundraiser Interaction.