REGIONAL SPECIALIZATION, URBAN HIERARCHY, AND COMMUTING COSTS*
构建了一个新型经济地理模型，其中所有企业和工人均可流动，集聚通过住房市场竞争产生成本。研究发现，当一种商品完全可流动时，对应产业部分分散而另一产业集聚，形成区域专业化；当一种商品不可贸易时，该产业更集聚，均衡涉及城市等级。
We consider an economic geography model of a new genre: All firms and workers are mobile and their agglomeration within a city generates costs through competition on a housing market. In the case of two sectors, contrasted patterns arise. When one good is perfectly mobile, the corresponding industry is partially dispersed whereas the other is agglomerated, thus showing regional specialization. When one sector supplies a nontradeable consumption good, this sector is more agglomerated than the other. The corresponding equilibrium involves an urban hierarchy in that a larger array of varieties of the two goods is produced within the same city.