This paper presents a formal theory of reciprocity. Reciprocity means that people reward kind actions and punish unkind … ones. The theory takes into account that people evaluate the kindness of an action not only by its consequences but also by … the intention underlying this action. The theory explains the relevant stylized facts of a wide range of experimental …

design and test a provision mechanism which utilizes rank competition to mitigate free-riding in impure public goods. In our … ranks, the contributions are significantly lower and decline over time. We thus provide evidence of rank competition, in …

Problems of cooperation have often been simplified as the choice between defection and cooperation, although in many … questionable whether known solutions to the problem of cooperation, such as punishment could still work, given the limited …-out motivates cooperation. Instead, when punishment is introduced, higher cooperation emerges in the compulsory game. This key …

We study spatially differentiated competition between charities by partnering with two foodbanks in two neighboring … spatially differentiated competition is characterized by sorting, crowding-in, and an absence of spillovers: Donors sort …

We examine the effectiveness of three democratically chosen rules that alleviate the coordination and cooperation … limitation of livestock numbers. All rules were designed in a way that facilitated cooperation or coordination of actions. The … not sufficient for high rule compliance and an overall enhancement in cooperation. Rules turned out to be inefficient if …