We elicit human conditional punishment types by conducting experiments. We find that their punishment decisions to an … individual are on average significantly positively proportional to other members’ punishment decisions to that individual. …

Norms of cooperation and punishment differ across societies, but also within a single society. In an experiment with … two subject pools sharing the same geographical and cultural origins, we show that opportunities for peer punishment … increase cooperation among students but not in the general population. In previous studies, punishment magnified the …

results of an experiment administered in the United States reported by Alm, Jackson and McKee (1992). The results for both …

This experiment investigates contests between groups. Each group has one strong player, with a higher valuation for the …

size, as in Adams (2002). Our experiment results show that for both production functions bigger groups reduce contribution …

, despite the absence of free-riding incentives. In a laboratory experiment, subjects indeed under-contribute relative to …

with Pareto-ranked equilibria. We report an experiment in which two groups compete in a weakest-link contest by expending …. As a result, intra-group communication decreases while inter-group communication increases payoffs. Our experiment thus …