Risk Pooling, Risk Preferences, and Social Networks
基于哥伦比亚70个社区的实验数据，研究在信任对风险分担安排至关重要时，谁与谁分担风险，发现亲密朋友和亲属会按风险偏好分类聚集，而陌生人则较少如此。
Using data from an experiment conducted in 70 Colombian communities, we investigate who pools risk with whom when trust is crucial for enforcing risk pooling arrangements. We explore the roles played by risk attitudes and social networks. Both empirically and theoretically, we find that close friends and relatives group assortatively on risk attitudes and are more likely to join the same risk pooling group, while unfamiliar participants group less and rarely assort. These findings indicate that where there are advantages to grouping assortatively on risk attitudes those advantages may be inaccessible when trust is absent or low.