“…Although preschool children may not relate allocation to a relative amount or quality of work when they are verbally interviewed about hypothetical scenarios (Damon, 1975, 1980), or when sharing rewards between self and a fictional other child on jointly earned rewards (Hook, 1978; Lane & Coon, 1972; Lerner, 1974; Leventhal & Anderson, 1970), research using less demanding tasks traced the ontogenetic origins of equity sensitivity to an earlier age. For example, 21-month-old infants looked longer at scenes in which a worker and a slacker were rewarded equally (Sloane, Baillargeon, & Premack, 2012); 3- to 5-year-olds distributed more cookies to a harder worker who contributed more to baking than to a lazy worker (Baumard, Mascaro, & Chevallier, 2012; Chevallier, Xu, Adachi, van der Henst, & Baumard, 2015); 6- to 8-year-olds even discarded resources as to avoid unequal distribution between equally deserving parties (Shaw & Olson, 2012); and children aged 4–11 in 13 diverse countries all showed an age-related increase in merit-based equity preferences (Huppert et al, 2019). When asked as a coworker to share rewards for work, 3-year-olds kept fewer rewards when they had contributed less than when they had contributed more than their partner (Kanngiesser & Warneken, 2012); they also shared more with their collaborator when they received undeserved rewards than when they received deserved rewards (Hamann, Bender, & Tomasello, 2014).…”