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sanction trust system cooperation condition group argument study power participant option people power use phase psychology expectation situation effect sanction condition member group members journal other patient evect result dilemmas outcome presence context wilke response ingroup behavior no-sanction condition interaction source dilemma attitude defection level research experiment contra arguments fellow group members support entrance exams decision competition / journal analysis number alternative defection option feedback competence outgroup mulder influence e fficiency subject personality exposure fficiency no-sanction alternative quality messick knippenberg van knippenberg cancer contra exposure time sanction support phase 2 phase 2 trust table estimate yamagishi erasmus univ rotterdam £ 2