Minimal conditions for the creation of a unit relationship: the social bond between birthdaymates
نویسندگان
چکیده
We hypothesize that sharing a birthday is sucient to create a unit relationship. Two studies demonstrated that individuals cooperated more in a prisoners dilemma game when their (®ctitious) opponent shared their birthday. They also reacted more negatively to betrayal and were less sensitive to relative gains for self versus other. # 1998 John Wiley & Sons, Ltd.
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