Determinants of In-group Bias: Group Affiliation or Guilt-aversion? Volume 2 Jena Economic Research Papers 2008-06-10 2008 2007 social preferences experiments social dilemma group identity guilt aversion In-group favoritism in social dilemma situations is one of the main findings of studies in Social Identity Theory. We investigate what causes the in-group bias: is it due to mere group affiliation or, alternatively, is guilt-aversion a possible explanation? We induce group membership in a minimal group setting, observe in-/out-group transfers and elicit respective beliefs. We find that mere group affiliation affects beliefs and explains a substantial part of the bias, but we also find evidence in favor of guilt-aversion as a source of motivation. 2008-046 jportal_jpjournal_00000016 2008-06-10T11:19:05.351Z 2010-12-17T11:53:47.141Z