students in economics. We manipulated the composition of groups to achieve a wide range of support, and assigned students … students of low and medium ability gain on average 0.2 SD units of achievement from switching from ability mixing to three …-way tracking. Their dropout rate is reduced by 15 percentage points (relative to a mean of 0.6). High-ability students are …

education, one essential aspect is that “good” peers can potentially improve students’ academic achievement, career choices, or …

Social theories posit that peers affect students' academic self-concept (ASC). Most prominently, Big …-Fish-Little-Pond, invidious comparison, and relative deprivation theories predict that exposure to academically stronger peers decreases students …' ASC, and exposure to academically weaker peers increases students' ASC. These propositions have not yet been tested …

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 …

students. We randomly assign around 10,000 middle school students in Karnataka, India, to alternative peer learning treatments … statistically and economically significant for students at the bottom of the ability distribution. We develop theoretical conditions …