Reciprocity is a pervasive type of social interaction in encounters, groups and organizations. This volume gathers basic recent works in its main domains such as the theory of reciprocity, the public economics of transfers, the economics of the family, charities, gifts of organs, or the motivations for gift-giving. The book constitutes a landmark in this rapidly expanding field of research.

Jean Mercier Ythier teaches at the University of Marseille. Serge-Christophe Kolm is Director and Professor and Louis-André Gérard-Varet is Professor at the Institute for Advanced Studies in Social Sciences, Paris.