university students who we randomly assign to study groups. Our results show that students become more similar to their peers … along several dimensions. Students with more competitive peers become more competitive, students with more open-minded peers … become more open-minded, and students with more conscientious peers become more conscientious. We see no significant effects …

This paper examines how exposure to students identified as gifted (IQ ≥ 130) affects achievement in secondary school … combined with psychological examination records, we study the causal impact of gifted students on their classmates in … unprecedented detail. We find a positive and significant effect of the exposure to gifted students on school achievement in both …

scores, high school GPA, and college-test taking over and above cognitive skills. Exploiting random assignment of students to …

An extensive literature in the social sciences analyzes peer effects among students, but estimation is complicated by … observations within peer groups noted by Angrist (2014). The field experiment randomly assigns students to one-to-one partnerships … effects but we find some evidence that low-ability peers negatively affect low-ability and medium-ability students. The …