Friends for richer or poorer: Economic connectedness, regional social capital, and county entrepreneurial activity
研究发现，不同社会经济地位人群间的友谊（经济联系）能促进县域创业活动，但社会网络的紧密性会削弱这种促进作用，而支持性网络则增强它。
In this study we propose that economic connectedness (friendship among individuals with different socioeconomic statuses) is associated with higher entrepreneurial activity, and regional social capital in the form of network cohesiveness related to clustering coefficient (support ratio) weakens (strengthens) this relationship. Using a sample of U.S. counties and controlling for focal-county lagged effects and conditions in the neighboring counties, we find support for the hypothesized effects. The proposed factors are not influenced by historic measures of county-level collectivism, gender inequality, or religiosity. Natural amenities in the focal county strengthen the association between economic connectedness and entrepreneurial activity.