期刊
ECONOMETRICA
卷 81, 期 3, 页码 855-882出版社
WILEY-BLACKWELL
DOI: 10.3982/ECTA10168
关键词
Peer effects; social network formation; homophily
类别
资金
- National Academy of Education
- National Science Foundation
- Spencer Foundation
- Divn Of Social and Economic Sciences
- Direct For Social, Behav & Economic Scie [1024841] Funding Source: National Science Foundation
We take cohorts of entering freshmen at the United States Air Force Academy and assign half to peer groups designed to maximize the academic performance of the lowest ability students. Our assignment algorithm uses nonlinear peer effects estimates from the historical pre-treatment data, in which students were randomly assigned to peer groups. We find a negative and significant treatment effect for the students we intended to help. We provide evidence that within our optimally designed peer groups, students avoided the peers with whom we intended them to interact and instead formed more homogeneous subgroups. These results illustrate how policies that manipulate peer groups for a desired social outcome can be confounded by changes in the endogenous patterns of social interactions within the group.
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