Partners in Crime
利用新划定的学校边界两侧的随机居住差异，研究发现将更多弱势学生聚集在同一学校会增加犯罪，且这些青少年更可能共同犯罪，表明邻里和学校隔离通过促进风险青少年之间的社会互动加剧了犯罪。
Social interactions may explain the large variance in criminal activity across neighborhoods and time. We present direct evidence of social spillovers in crime using random variation in neighborhood residence along opposite sides of a newly drawn school boundary. We first show evidence for agglomeration effects—within small neighborhood areas, grouping more disadvantaged students together in the same school increases total crime. We then show that these youths are more likely to be arrested for committing crimes together—to be “partners in crime.” Our results show that neighborhood and school segregation increase crime by fostering social interactions between at-risk youth.