Search, Sorting, and Urban Agglomeration
构建模型说明城市集聚通过促进企业与工人的匹配提升生产率，但会导致技能群体间的工资不平等和技能投资回报上升，并用美国县级和都市区数据验证。
Studies have suggested that urban agglomeration enhances productivity by facilitating the firm-worker matching process. This article develops a model that formalizes this notion and demonstrates that, when firm capital and worker skill are complementary in production, urban agglomeration will tend to generate more efficient, yet segregated matches. As a result, not only will local market size be positively associated with average productivity, it will also generate greater between-skill-group wage inequality and a higher expected return to skill acquisition. Recent data from the counties and metropolitan areas of the United States is consistent with each of these implications. Copyright 2001 by University of Chicago Press.