We study the effect of group size on cooperation in voluntary contribution mechanism games. As in previous experiments … find that cooperation is highest of all in two-person groups. The findings in the high MPCR condition are consistent with … those from n-person prisoner’s dilemma and oligopoly experiments that suggest it is more difficult to sustain cooperation …

identity between the leader and her followers is beneficial for cooperation: average contributions are more than 30% higher … identities. We find no effect on cooperation when only part of the followers share the leader’s identity, or when followers share … instrument to promote cooperation. …

We experimentally investigate cooperation in privileged groups which according to Olson (1965) are groups in which at … opportunities, heterogeneity crucially affects cooperation and coordination within groups. Compared to non-privileged groups …

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 …

cooperation. …

cooperation. …