Development of human societies requires cooperation among unrelated individuals and obedience to social norms. Although … punishment is widely agreed to be potentially useful in fostering cooperation, many recent results in psychology and economics … eliminate its detrimental effects on cooperation. In a public goods game designed to create tension between group and individual …

initial cooperation rates are similar, it increases in the groups with higher intelligence to reach almost full cooperation … differences in the response to past cooperation of the partner. In higher intelligence subjects, cooperation after the initial … difference is absent. Cooperation of higher intelligence subjects is payoff sensitive, thus not automatic: in a treatment with …

intermediary organizations facilitate coordination among donors and reduce such risks. To study this, we extend a threshold public …

medium sized and large groups and show that neighborhood choice indeed leads to coordination on the fully efficient …

We test if cooperation is promoted by rank-order competition between groups in which all groups can be ranked first, i … are absent if groups perform at the same level and it therefore does not eliminate low-cooperation equilibria. We find … that all-can-win competition produces a universal increase in cooperation and benefits a majority of individuals if …

BoS, with high and low payoff inequality. In PD, disclosure markedly hampers cooperation, as higher intelligence players … with low payoff inequality, disclosure disrupts coordination, as higher intelligence players try to force their most … does not significantly affect coordination, while coordination is more often on outcomes that favor the less intelligent …

-person gift-exchange experiment we find causal evidence for peer effects in voluntary cooperation: agents' efforts are positively …

concept of cooperation and explore the extent to which this intervention brings about changes in peopleﾒs voluntary … contributions to the public good and self-reported emotional responses. Our findings suggest that priming cooperation increases …

We use skin conductance responses and self-reports of hedonic valence to study the emotional basis of cooperation and …. The application of sanctions activates a "virtuous emotional circle" that accompanies cooperation. Emotionally aroused … punished, and increase their subsequent level of cooperation. The outcome is an increased level of contribution that becomes …