The ties that bind us: Social networks and productivity in the factory
利用印度服装厂的高频工人生产力数据，研究发现生产线中同种姓工人比例每增加1个百分点，个人日生产力至少提高0.09个百分点，且对最低效工人影响更大，表明种姓网络通过同伴效应产生生产外部性。
We use high frequency worker level productivity data from garment manufacturing units in India to study the effects of caste-based social networks on individual and group productivity when workers are complements in the production function. Using plausibly exogenous variation in the production lines' caste composition for almost 35,000 worker-days, we find that a 1 percentage point (pp) increase in the share of own caste workers in the line increases daily individual productivity by at least 0.09 pp. The least efficient worker's productivity, however, rises by almost 0.17 pp when the caste composition of the line becomes more homogeneous by 1 pp. These results are robust to unobservable heterogeneity in worker ability and line level trends. Production externalities, that induce greater effort through within-network peer effects, can potentially explain our findings.