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 …

We study the development of cooperation in 929 young children, aged 3 to 6. In a unified experimental framework, we … game. We find that third-party punishment doubles cooperation rates in comparison to a control condition. Children also … influence of children's cognitive skills and parents' socioeconomic background on cooperation. …

' prosocial attitudes are systematically related to elementary school children's prosociality. In a second step, we present … evidence on a randomly-assigned variation of the social environment, providing children with a mentor for the duration of one … gap in prosociality between low and high SES children. A mediation analysis of the observed treatment effect suggests that …