Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management)
Online ISSN : 2185-6540
ISSN-L : 2185-6540
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Paper (In Japanese)
  • Hiroki AIZAWA, Kiyohiro IKEDA, Yosuke KOGURE, Minoru OSAWA, José Mari ...
    2020 Volume 76 Issue 4 Pages 282-298
    Published: 2020
    Released: October 20, 2020
    JOURNALS RESTRICTED ACCESS

     In new economic geography, economic agglomeration is known to be governed by bifurcation. However, the majority of theoretical researches focuses on two-place economy and racetrack economy and abstract from geographical advantage which are pervasive in the real world. In this paper, we focus on a long narrow economy, in which discrete locations are equally spread over a line segment. By group-theoretic bifurcation theory, we elucidate the bifurcation mechanism of monocentric city on this economy analytically. Emergence of satellite cities around a primary city is shown to be exist. By numerical analysis of Forslid & Ottaviano model with replicator dynamics, we show that the higher the expenditure share of manufactured goods is or the lower the elasticity of substitution is, the farther from the monocentric city satellite cities emerge.

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  • Shunsuke SEGI, Kiyoshi KOBAYASHI, Kakuya MATSUSHIMA
    2020 Volume 76 Issue 4 Pages 299-313
    Published: 2020
    Released: October 20, 2020
    JOURNALS RESTRICTED ACCESS

     This study assumes that there is aggregate heterogeneity of the local menus (goods) produced in different regions, and the households have preference for the variety of local menus. Then, this study analyzes the structure of urban system composed of two regions. In order to conduct the analysis, this study introduces the households’ preference for the variety of local menus into the Core-Periphery model of Krugman. Then, this study analyzes the effect of reduction in transportation cost between the regions on the population distribution across the regions. Through the analysis, this study shows that the reduction in transportation cost between the regions can promote the population dispersion across the regions if the households’ preference for the variety of local menus is sufficiently strong. In addition, this study shows that reinforcement of households’ preference for the variety of local menus also promote the population dispersion across the regions.

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  • Yuto SHIOZAKI, Yuki TAKAYAMA
    2020 Volume 76 Issue 4 Pages 314-333
    Published: 2020
    Released: November 20, 2020
    JOURNALS RESTRICTED ACCESS

     Migration caused by an external force such as a natural disaster and war can make a sustained city slip into decline. This paper defines Absorptive capacity as the ability of an urban system to tolerate the emigration generated by an external force and recover its previous condition. The paper establishes a two-city small open model based on New Economic Geography to show the following characteristics of urban systems’ Absorptive capacities. First, the high freeness of trade leads to an enhancement of both cities’ Absorptive capacities. Second, the high convenience of inner-city traffic in one city increases not only the city’s Absorptive capacity but also the other city’s capacity. Finally, the high productivity of industry in one city results in an improvement of the city’s Absorptive capacity but causes a reduction of the other city’s capacity.

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