Peers play an essential role in cognitive and non-cognitive skills formation. Ordinal rank may also change incentives and environment, impacting students’ efforts. Using two rich administrative data sets and a rule of admission at one top university in Brazil that split students in two...

Affirmative action in higher education can lead to mismatch, where students admitted through preferential treatment struggle academically due to inadequate preparation before college. Although some students may face initial challenges, by providing access to quality education for talented...

Lead exposure has detrimental effects on fertility, infants, children, and adults. Despite the success in removing lead from on-road gasoline, industrial and aviation emissions continue to pose a substantial global challenge. Other major sources of exposure include dust, soil resuspension, and...