Understanding the roots of human cooperation among strangers is of great importance for solving pressing social dilemmas and maintening public goods in human societies. We study the development of cooperation in 929 young children, aged 3 to 6. In a unified experimental framework, we examine...

We study the development of cooperation in 929 young children, aged 3 to 6. In a unified experimental framework, we examine pre-registered hypotheses about which of three fundamental pillars of human cooperation – direct and indirect reciprocity, and third-party punishment – emerges earliest...

We study the relationship between parenting style and a broad range of children’s skills and outcomes. Based on survey and experimental data from 5,580 children and their parents, we find that children exposed to positive parenting have higher IQs, are more altruistic, open to new...