Does Shared Group Membership Promote Altruism?

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Altruism toward in-group members as a reputation mechanism (2010, unknown): “The purpose of the first experiment was to demonstrate that, although Yamagishi and Mifune (2008) had shown that the private knowledge condition eliminates in-group favoritism in a minimal group paradigm, the effects of the absence of common knowledge can apparently be ameliorated by the presence of”
Dictator games: a meta study (2011, background): “…2008; Oxoby and Spraggon 2008; Slonim and Garbarino 2008; Stephen and Pham 2008; Swope, Cadigan et al. 2008; van der Merwe and Burns 2008; Yamagishi and Mifune 2008; Yamamori, Kato et al. 2008; Ackert, Gillette et al. 2009; Andrade and Ariely 2009; Andreoni and Bernheim 2009; Barr,…”
Ingroup favoritism in cooperation: a meta-analysis. (2014, background): “BGR predicts that such an effect in dictator games emerges because people are concerned about their reputation even when there is no interdependence with that ingroup member (Yamagishi & Mifune, 2008).”
Social exchange and solidarity: in-group love or out-group hate? (2009, background): “It is the product of an evolutionary game in which intra-group cooperation enhances one's reputation within the group (Yamagishi & Mifune, 2008).”