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 …

Traditionally economic theory assumes that preferences are stable facilitating positive predictions of economic policy …. While there is conflicting experimental evidence on the temporal stability of cooperation preferences in public goods … literature by testing whether social identity impacts on cooperation preferences in public goods provision. Specifically, our …