Social learning about climate risks
利用Facebook社交连接指数构建社交网络矩阵，研究发现飓风哈维和艾尔玛引发的洪水促使全美各县根据与受灾区的社交网络距离增加洪水保险购买，表明社会学习推动了气候风险认知更新。
Abstract With a social network adjacency matrix constructed from the Facebook Social Connectedness Index (SCI), this paper examines whether social learning facilitates climate risk perception updates to inform climate adaptation. We find that Hurricanes Harvey and Irma‐induced regional flooding increased flood insurance policies nationwide to the extent of each county's social network proximity to the flooded areas, with a corresponding update in climate risk perception. Social learning resulted in an additional 250,000 policies in flooded counties and 81,000 policies in unflooded counties over 3 years. We find evidence of the salience effect but no support for adverse selection or over‐insurance.