This paper reports lab data from four games in order to analyze and compare the motivations behind monetary punishment and reward and their non-monetary counterparts, disapproval and approval, an important question given that both types of punishment/rewards affect cooperation and norm...

This paper explores the motivations behind punishment from unaffected third parties and affected second parties using a within-subjects design in ten simple games. We apply a classification analysis and find that a parsimonious model assuming that subjects are either inequity averse or selfish...

Recently developed models of fairness can explain a wide variety of seemingly contradictory facts. The most controversial and yet unresolved issue in the modeling of fairness preferences concerns the behavioral relevance of fairness intentions. Intuitively, fairness intentions seem to play an...

Lecture on the first SFB/TR 15 meeting, Gummersbach, July, 18 - 20, 2004: We report on several experiments on the optimal allocation of ownership rights. The experiments confirm the property rights approach by showing that the ownership structure affects relationship-specific investments and...

Chapter written for the Handbook of Reciprocity, Gift-Giving and Altruism

Most economic models are based on the self-interest hypothesis that assumes that all people are exclusively motivated by their material self-interest. In recent years experimental economists have gathered overwhelming evidence that systematically refutes the self-interest hypothesis and suggests...