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One reason for people's voluntary cooperation in social dilemmas, or altruistic behavior in general, may be their belief that altruism pays off in terms of long-run self-interest Although this is often true, it is typically false in large-scale social dilemmas among strangers In three questionnaire studies, subjects endorsed this self-interest illusion frequently for large-scale dilemmas, such as overfishing and pollution, in which the benefits of cooperation are delayed.
Jonathan Baron (Tue,) studied this question.