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This article reports 2 studies investigating the effects of retrospective thought on future cooperation in social dilemmas. Some general theories of cooperation presume, but have not tested, whether retrospection has impact: People may think about the choices they could have made instead, realize that cooperation would have produced larger outcomes, and change their strategy as a result. Across both studies, the authors show that rate of future cooperation is directly related to the number ofdoi:10.1037/0022-35220.127.116.118 pmid:12757143 fatcat:dohlxqhaeba6bawovdd2mz5qzy