Homelessness and Crime: Do Your Friends Matter?
利用无家可归者的数据，研究朋友数量及犯罪朋友比例对犯罪的影响，发现多一个朋友降低入狱概率，但犯罪朋友增加则提高入狱概率。
This article investigates the influence of friends on crime, using data I collected among the homeless. To estimate the causal effects of friends and of the share of criminal friends on crime, I rely on two instruments. The first is the share of rainy days during one’s first year as homeless: rainfall fosters homeless concentration in sheltered places and increases the probability of interactions. The second is the share of inmates released during one’s first year as homeless, which affects the supply of criminal friends. I find that one additional friend decreases the probability of incarceration but criminal friends increases it.