The immense literature on discrimination treats outcomes as relative: One group suffers compared to another. But does a difference arise because agents discriminate against others--are exophobic--or because they favor their own kind--are endophilic? This difference matters, as the relative...

The discrimination literature treats outcomes as relative. But does a differential arise because agents discriminate against others—exophobia—or because they favour their own kind—endophilia? Using a field experiment that assigned graders randomly to students' exams that did/ did not...

The immense literature on discrimination treats outcomes as relative: One group suffers compared to another. But does a difference arise because agents discriminate against others – are exophobic – or because they favor their own kind – are endophilic? This difference matters, as the...

This paper provides evidence on ability peer effects in university education. Identification comes from the random assignment of students to sections. We find that students on average benefit from better-ability peers. Low-ability students, however, are harmed by high-ability peers. We introduce...