Children recognize and reject favoritism in norm enforcement

The impartial enforcement of norms and laws is a hallmark of fair societies, yet partial, unequal norm enforcement is common, for example as a result of corruption. While children condemn norm violations and value impartiality in resource allocation contexts, children's understanding of unequal norm enforcement is currently underexplored. In three vignette studies, we investigated 4- to 8-year-old's (N = 192) developing recognition and condemnation of unequal norm enforcement, which presupposes a sensitivity to impartiality as a meta-norm. Children evaluated the actions of characters who enforced different norms equally or unequally. From age 5, children disapproved of unequal norm enforcement but approved of unequal treatment when justified (Study 1). Children of all ages accepted a lack of punishment when applied equally to all transgressors, suggesting that their negative evaluations of unequal norm enforcement were specifically guided by the element of partiality and not the desire to see transgressors sanctioned (Study 2). Further, children aged 6 years and older were sensitive to the reasons behind unequal punishment, condemning instances of favoritism while accepting selective leniency due to mitigating circumstances (Study 3). The findings show that, from around 5 to 6 years of age, children condemn unequal sanctions for equal transgressions, thereby demonstrating a deep appreciation of impartiality as a foundational principle of fair norm enforcement.