We show in a public goods experiment on three continents that conditional cooperation is a universal behavioral ….S.A. than anywhere else. -- conditional cooperation ; public goods ; experiment … regularity. Yet, the number of conditional cooperators and the extent of conditional cooperation are much higher in the U …

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 …

random, in and out group matching protocols. Our findings indicate that cooperation preferences are not stable across these … preference for higher levels of conditional cooperation and thus less self serving bias than in out group matching. Additionally …Traditionally economic theory assumes that preferences are stable facilitating positive predictions of economic policy …

laboratory experiment in which subjects purchase products associated with externalities. In six between-subjects treatments, we …

. We study in an experiment with 336 kindergarten children, aged three to six years, whether intertemporal choice behavior …

of vigilant neighbors. This model proved to support cooperation in specific conditions, and here we check its robustness …