We experimentally investigate the nature of cooperation in various repeated games, with subjects from Romania and USA …. We find stark cross-country differences in the propensity to sustain multilateral cooperation through bilateral rewards …

Previous experiments have found a moderate, positive effect of group size on cooperation in voluntary contribution … results from n-person prisoner's dilemma and oligopoly experiments where group size has a negative effect on cooperation. In … instead be more evident in smaller groups. We test this conjecture in an experiment where we compare 2- 3- and 4-person VCM …