- to eleven-year old primary school children in the city of Meran, we find that cooperation generally increases with age …, but that the gap between cooperation among in-group members and cooperation towards children speaking another language is …

We investigate how group boundaries, and the economic environment surrounding groups, affect altruistic cooperation and … harm those who defect, encouraging a norm of cooperation towards the group. Adding competition between groups causes even … stronger in-group cooperation, but also a qualitative change in punishment: punishment becomes anti-social, harming cooperative …

We examine experimentally two different types of trust: trust in another party’s cooperation and trust in ability. In … the cooperation condition, player A sends x ? {0, X} to player B. The amount x is multiplied by c = 3, and B can return y … ability condition, but no significant effect in the cooperation condition. …

We examine gender differences in trust in another party?s cooperation (CC) or its ability (AC). While men and women do … not differ concerning trust in cooperation, gender has a strong influence when trust in another subject?s ability is …