Multimodal agglomeration in economic geography
Multimodal agglomeration in economic geography
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发表时间：
2019-12
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通讯作者：
Takashi Akamatsu;Tomoya Mori;M. Osawa;Y. Takayama
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作者：
Takashi Akamatsu;Tomoya Mori;M. Osawa;Y. Takayama
以许多城市存在的形式存在的多式联运集聚主导着现代经济地理。我们关注的是多峰集聚内生实现的机制。在具有集聚力和分散力的空间模型中，分散力的空间尺度(局部或全局)决定了内生空间分布是否变为多峰。多式联运模式只有在全球分散力下才能出现，例如竞争效应，这会导致偏离现有集聚的地点，并导致单独的集聚。当地的分散力量，如当地土地的稀缺，导致现有的集聚体被夷为平地。如果这样的力是色散的唯一来源，那么由此产生的空间构型是单峰的。这一观点允许我们将现有的模型分为三个原型类：只有全局的、只有局部的、以及局部和全局的分散力。分类法有助于根据每项研究的目标进行模型选择。
Multimodal agglomerations, in the form of the existence of many cities, dominate modern economic geography. We focus on the mechanism by which multimodal agglomerations realize endogenously. In a spatial model with agglomeration and dispersion forces, the spatial scale (local or global) of the dispersion force determines whether endogenous spatial distributions become multimodal. Multimodal patterns can emerge only under a global dispersion force, such as competition effects, which induce deviations to locations distant from an existing agglomeration and result in a separate agglomeration. A local dispersion force, such as the local scarcity of land, causes the flattening of existing agglomerations. The resulting spatial configuration is unimodal if such a force is the only source of dispersion. This view allows us to categorize extant models into three prototypical classes: those with only global, only local, and local and global dispersion forces. The taxonomy facilitates model choice depending on each study's objective.