In this paper we provide experimental evidence indicating that incentive contracts may cause a strong crowding out of reciprocity-driven voluntary cooperation. This crowding out effect constitutes costs of incentive provision that have been largely neglected by economists. In our experiments the...

Social norms are a ubiquitous feature of social life and pervade almost every aspect of human social interaction. However, despite their importance we still have relatively little empirical knowledge about the forces that drive the formation, the maintenance and the decay of social norms. In...

Several authors suggest that trust is an important determinant of cooperation between strangers in a society, and therefore of performance of social institutions. We argue that trust should be particularly important for the performance of large organizations. In a cross-section of countries,...

Several authors suggest that trust is an important determinant of cooperation between strangers in a society, and therefore of performance of social institutions. We argue that trust should be particularly important for the performance of large organizations. In a cross-section of countries,...

Repeated interactions provide a prominent but paradoxical hypothesis for human cooperation in one-shot interactions. Intergroup competitions provide a different hypothesis that is intuitively appealing but heterodox. We show that neither mechanism reliably supports the evolution of cooperation...