“…Whereas adults are willing to incur personal costs to ensure equality between themselves and an anonymous stranger (e.g., an adult would rather share two dollars equally with a stranger, such that each receives one dollar, than receive two dollars and leave nothing for a stranger), this willingness does not seem to emerge until 7-8 years of age (e.g., Fehr, Bernhard, & Rockenbach, 2008;Sheskin, Bloom, & Wynn, 2014). These findings, in combination with recent work showing that young children behave more selfishly when handling monetary compared to non-monetary goods (Gasiorowska, Chaplin, Zaleskiewicz, Wygrab, & Vohs, 2016), suggest that attention to moral history may develop in tandem with children's increase in moral concern. Understanding this issue becomes important given our finding that moral history guides people's behavior and understanding of the material world.…”