Endogenous agglomeration in a many-region world
Endogenous agglomeration in a many-region world
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发表时间：
2019-12
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通讯作者：
T. Akamatsu;Tomoya Mori;M. Osawa;Yuki Takayama
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作者：
T. Akamatsu;Tomoya Mori;M. Osawa;Yuki Takayama
我们研究了一类具有内生集聚特征的一般经济地理模型。在许多地区的环境中，模型中的弥散力(S)的空间尺度-“全局”或“局部”-在决定由此产生的内生空间模式和比较静力学中起着关键作用。全球分散力来自不同地点之间的竞争，并导致多个经济集群(或城市)的形成。局部分散力是由每个地点内的拥挤效应引起的，并导致每个城市的扁平化。通过区分局部弥散力和全局弥散力，我们可以定义三个原型类，即只有全局弥散力、只有局部弥散力以及既有局部弥散力又有全局弥散力的模型。这三个模型类产生了本质上不同的空间模式。只有当全球分散力发挥作用时，才会形成多个城市；否则，只能形成单峰分布。只有当当地的分散力发挥作用时，城市才能有其空间范围。现存的各种模型被归结为三个原型类。我们的框架为实证文献增加了一致的解释，并提供了对结构经济地理模型中处理效应的一般见解。
We study a general family of economic geography models that features endogenous agglomeration. In many-region settings, the spatial scale---"global" or "local"---of the dispersion force(s) in a model plays a key role in determining the resulting endogenous spatial patterns and comparative statics. A global dispersion force accrues from competition between different locations and leads to the formation of multiple economic clusters (or cities). A local dispersion force is caused by crowding effects within each location and induces the flattening of each city. By distinguishing local and global dispersion forces, we can define three prototypical classes, namely, models that have only global, only local, and both local and global dispersion forces. The three model classes engender qualitatively different spatial patterns. Multiple cities are formed only when a global dispersion force is at work; otherwise, only a unimodal distribution can be formed. A city can have its spatial extent only when a local dispersion force is at work. A wide variety of extant models are reduced into the three prototypical classes. Our framework adds consistent interpretations to the empirical literature and also provides general \Red{insights into} treatment effects in structural economic geography models.