Social networks and interactions in cities

• 成果类型: Article
• 署名作者: Helsley, Robert W.; Zenou, Yves
• 署名单位: University of British Columbia; Stockholm University; Research Institute of Industrial Economics (IFN); University of Southampton
• 刊物名称: JOURNAL OF ECONOMIC THEORY
• ISSN/ISSBN: 0022-0531
• DOI: 10.1016/j.jet.2013.09.009
• 发表日期: 2014
• 页码: 426-466
• 关键词: Social networks; Urban-land use; spatial mismatch; Network centrality

摘要

We examine how interaction choices depend on the interplay of social and physical distance, and show that agents who are more central in the social network, or are located closer to the geographic center of interaction, choose higher levels of interactions in equilibrium. As a result, the level of interactivity in the economy as a whole will rise with the density of links in the social network and with the degree to which agents are clustered in physical space. When agents can choose geographic locations, there is a tendency for those who are more central in the social network to locate closer to the interaction center, leading to a form of endogenous geographic separation based on social distance. We also show that the market equilibrium is not optimal because of social externalities. We determine the value of the subsidy to interactions that could support the first-best allocation as an equilibrium. Finally, we interpret our model in terms of labor-market networks and show that the lack of good job contacts would be here a structural consequence of the social isolation of inner-city neighborhoods. (C) 2013 Elsevier Inc. All rights reserved.