People behave pro-socially in a wide variety of situations that standard economic theory is unable to explain. Social comparison is one explanation for such pro-social behavior: people contributeif others contribute or cooperate as well....

The ability to cooperate in collective action problems — such as those relating to the useof common property resources or the provision of local public goods — is a key determinant ofeconomic performance. In this paper we discuss two aspects of collective action problemsin developing...

In this paper, we study a voluntary contribution mechanism withone-way communication. The relevance of one person’s words is assessedby assigning exogeniously the role of the ‘communicator’ to onegroup member. Contrary to the view that the mutual exchange ofpromises is necessary for the...

In public good provision, privileged groups enjoy the advantage that some of its membersfind it optimal to supply a positive amount of the public good. However, their inherentasymmetric nature may make the enforcement of cooperative behavior through informalsanctioning harder to accomplish...