social interaction effects. Testing for such effects raises severe identification problems. We conduct an experiment that …

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 … the intention underlying this action. The theory explains the relevant stylized facts of a wide range of experimental …

interaction effects. We conduct an experiment that avoids the identification problem present in the field. Our novel design …

interaction effects. We conduct a laboratory experiment that avoids the identification problem present in the field and allows us …