I. Almas et al., “Fairness and the Development of Inequality Acceptance,” Sci 328 (2010): 1176; E. Fehr et al., “Egalitarianism in Young Children,” Nat 454 (2008): 1079; K. Olson et al., “Children’s Responses to Group-Based Inequalities: Perpetuation and Rectification,” Soc Cog¯29 (2011): 270; M. Killen, “Children’s Social and Moral Reasoning About Exclusion,” Curr Dir Psych Sci 16 (2007): 32.