title: Cooperation during cultural group formation promotes trust towards members of out-groups.
abstract: People often cooperate with members of their own group, and discriminate against members of other groups. Previous research establishes that cultural groups can form endogenously, and that these groups demonstrate in-group favouritism. Given the presence of cultural groups, the previous literature argues that cultural evolution selects for groups that exhibit parochial altruism. The source of initial variation in these traits, however, remains uninformed. We show here that a group's economic production environment may substantially influence parochial tendencies, with groups formed around more cooperative production (CP) displaying less parochialism than groups formed around more independent production (IP) processes. Participants randomized into CP and IP production tasks formed cultural groups, and subsequently played hidden-action trust games with in-group and out-group trustees. We found CP to be associated with significantly greater sharing and exchanging behaviours than IP. In trust games, significant parochial altruism (in-group favouritism combined with out-group discrimination) was displayed by members of IP groups. By contrast, members of CP groups did not engage in either in-group favouritism or out-group discrimination. Further, we found the absence of out-group discrimination in CP to persist even following 'betrayal'. Finally, belief data suggest that members of CP are not more intrinsically generous than IP members, but rather more likely to believe that out-group trustees will positively reciprocate. Our results have important implications for anyone interested in building cooperative teams, and shed new light on connections between culture and cooperation.
authors: Department of Economics, National Bureau of Economic Research, Harvard University, 1050 Massachusetts Avenue, 4th Floor, Cambridge, MA 02138, USA. xpan@fas.harvard.edu
authors: Xiaofei Sophia
authors: XS
authors: Pan
authors: Daniel
authors: D
authors: Houser
mesh_terms: D000533:Altruism; D003299:Cooperative Behavior; D003469:Culture; D005260:Female; D005717:Games, Experimental; D006126:Group Processes; D006801:Humans; D008297:Male; D035502:Trust
keywords: cultural group formation; in-group favouritism; out-group discrimination; trust
references: Science. 2008 Sep 26;321(5897):1844-9
references: 18818361
references: Proc Natl Acad Sci U S A. 2009 Mar 17;106(11):4138-42
references: 19255433
references: Science. 2008 Mar 7;319(5868):1362-7
references: 18323447
references: Nature. 2006 Aug 24;442(7105):912-5
references: 16929297
references: J Pers Soc Psychol. 1972 Mar;21(3):384-8
references: 5060754
references: Science. 2008 Mar 7;319(5868):1345-6
references: 18323439
references: Science. 2006 Dec 8;314(5805):1569-72
references: 17158320
references: J Theor Biol. 1990 Aug 9;145(3):331-42
references: 2232821
references: Science. 2007 Oct 26;318(5850):636-40
references: 17962562
references: Science. 2010 Mar 19;327(5972):1480-4
references: 20299588
references: Proc Natl Acad Sci U S A. 2009 Apr 14;106(15):6187-91
references: 19332775
references: Psychol Sci. 2008 Apr;19(4):405-11
references: 18399895
references: Evol Hum Behav. 2000 Nov;21(6):411-427
references: 11146306