Basic Study on the Mechanisms of the Spatial Distribution of Economic Activity

以下是我进行的四个研究项目的摘要。(1)推导了全经济生产率与城市和行业生产率之间的关系，使我们能够将宏观层面的增长动态分解为城市或行业层面的增长动态。(2)研究表明，土地作为生产的固定投入，在解释知识型员工的空间分拣中具有重要作用。(3)将区域间任务贸易引入城市经济分析，从理论上识别了不同生产阶段的多城市专业化机制。使用美国的数据集，验证了该模型的预测是有效的。(4)构建了一个计算可行的模型，该模型适用于分析信息通信技术和计算机化对城市层级的影响。

The followings are abstracts of four research projects I have conducted.(1) I derived a relationship between the economy-wide productivity and city-level and industry-level productivities, which allows us to decompose the macro-level growth dynamics into city-level or industry-level growth dynamics. (2) I showed that land as a fixed input of production is important in explaining the spatial sorting of knowledge workers. (3) I introduced task trade between regions into the urban economic analysis and theoretically identified the mechanism of specialization of multiple cities in different stages of production. Using a U.S. dataset, it was verified that the model's predictions are valid. (4) I built a computationally feasible model that is suitable for an analysis on the effects of information and communication technology and computerization on urban hierarchy.