We test whether humans are intuitively inclined to cooperate with or punish strangers using a natural field experiment … pressure can increase rates of punishment. We discuss our results with respect to findings in the lab on cognitive models of …

and indirect reciprocity as well as third-party punishment – emerges earliest as an effective means to increase … cooperation in a repeated prisoner’s dilemma game. We find that third-party punishment exhibits a strikingly positive effect on … cooperation rates by doubling them in comparison to a control condition. It promotes cooperative behavior even before punishment …

and indirect reciprocity as well as third-party punishment – emerges earliest as an effective means to increase … cooperation in a repeated prisoner’s dilemma game. We find that third-party punishment exhibits a strikingly positive effect on … cooperation rates by doubling them in comparison to a control condition. It promotes cooperative behavior even before punishment …

and indirect reciprocity as well as third-party punishment – emerges earliest as an effective means to increase … cooperation in a repeated prisoner's dilemma game. We find that third-party punishment exhibits a strikingly positive effect on … cooperation rates by doubling them in comparison to a control condition. It promotes cooperative behavior even before punishment …

and indirect reciprocity as well as third-party punishment - emerges earliest as an effective means to increase … cooperation in a repeated prisoner's dilemma game. We find that third-party punishment exhibits a strikingly positive effect on … cooperation rates by doubling them in comparison to a control condition. It promotes cooperative behavior even before punishment …

and indirect reciprocity as well as third-party punishment - emerges earliest as an effective means to increase … cooperation in a repeated prisoner's dilemma game. We find that third-party punishment exhibits a strikingly positive effect on … cooperation rates by doubling them in comparison to a control condition. It promotes cooperative behavior even before punishment …

reciprocity, and third-party punishment – emerges earliest as a means to increase cooperation in a repeated prisoner's dilemma … game. We find that third-party punishment doubles cooperation rates in comparison to a control condition. Children also …