This paper presents a formal theory of reciprocity. Reciprocity means that people reward kind actions and punish unkind …

This paper reports an experiment which compares behaviour in two punishment regimes: (i) a standard public goods game …

Explaining human cooperation in large groups of non-kin is a major challenge to both rational choice theory and the … theory of evolution. Recent research suggests that group cooperation can be explained by positing that cooperators can punish … information conditions, where cheating is less obvious, punishment is much less effective in enforcing cooperation. Evidently, the …

We investigate experimentally whether the extent of conditional cooperation in public good games depends on the … conditional cooperation. We also find no evidence that the type of game makes a difference to unconditional contributions. The …