dilemmas and maintening public goods in human societies. We study the development of cooperation in 929 young children, aged 3 … of defectors is applied. Children also engage in reciprocating others, showing that reciprocity strategies are already … young children fail to anticipate the benefits of reputation building. We also show that the cognitive skills of children …

- 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 …