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 …

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 …

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 …

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 …

fundamental, properties in graph theory allow us to interpret the variation in the patterns of behavior that arise in the …

and its impact on cooperation of its members are yet not well understood. We experimentally investigate community choice …