FIGURE 1. The relative frequency of egalitarian choices across all ingroup treatments.

In these treatments, the decision maker's choice determines the resources of an ingroup partner. The frequency of egalitarian choices strongly increases with age across all three ingroup treatments, and most children prefer equality at age 7–8 in the prosocial and the envy game. However, if equality is costly for the children, they choose the egalitarian allocation less frequently—as indicated by the behaviour in the sharing game—and at age 3–4, self-interested choices dominate almost completely.

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