Explaining the evolution and maintenance of cooperation among unrelated individuals is one of the fundamental problems in biology and the social sciences. Recent experimental evidence suggests that altruistic punishment is an important mechanism to maintain cooperation among humans. In this...

Why do people in rich countries not transfer more of their income to people in the world's poorest countries? To study this question and the relative importance of needs, entitlements, and nationality in people's social preferences, we conducted a real effort fairness experiment where people in...

This discussion paper has resulted in the publication (2007) 'Order without law? Experimental evidence on voluntary cooperation and sanctioning', 2007, KritV - Kritische Vierteljahresschrift fur Gesetzgebung und Rechtswissenschaft, 90, 1-2, 140-155.In this paper we discuss experimental evidence...