We apply a novel approach to estimate the effects of exposure to peers with different attributes by using the predetermined leave-own-out attributes of all classmates in randomly assigned classes. This strategy allows a behavioural interpretation of the peer effect over and above the pure...

Prior research has found that boys often outperform girls in high-stakes math exams, raising the question of whether these gender differences under pressure stem from nature or nurture. This relative female disadvantage can influence access to selective university programs and subsequent career...