The Urban Economics Workshop 2023
空間情報科学研究センター（CSIS）との共催ワークショップ

修士論文報告会

13:00-13:30 報告者：田中瑞希
TBA
（主査：佐藤泰裕、副査：高橋孝明・古沢泰治）

13:30-14:00 報告者：牧野佑哉
TBA
（主査：佐藤泰裕：副査：高橋孝明・山口慎太郎）

14:00-14:30 報告者：Qingzhao YU
TBA
（主査：高橋孝明、副査：佐藤泰裕・川田恵介）

14:30-15:00 報告者：森本拓歩
TBA
（主査：川田恵介、副査：高橋孝明・佐藤泰裕）

芝　啓太（九州産業大学）
"After the Fukushima Daiichi Nuclear Accident, Land Prices Around Nuclear Power Plants in Kyushu"

Marcus Berliant (Washington University)
"Agglomeration in Purely Neoclassical and Symmetric Economies" with Axel Watanabe [Paper]

芝　啓太（九州産業大学）
How land prices around nuclear power plant sites change after the Fukushima nuclear accident? This study focuses on two nuclear power plants (the Sendai and the Genkai nuclear power plants) in the Kyushu region of Japan. These two nuclear power plants were shut down after the Fukushima accident and then restarted. Using the Difference-in-Differences method, I find that land prices within a 30 km radius of the Genkai and the Sendai nuclear power plants have experienced decreases compared to other areas.

Marcus Berliant（Washington University）
This article demonstrates the emergence of agglomeration unaccompanied by any conventional explanatory factors such as scale economies, externalities or comparative advantages. Agglomeration forms out of inter-regional migration prompted by households seeking the type of consumers that complements their endowments. We construct a general equilibrium model with four commodities, four types of heterogeneous households, and linear production over two regions. Spatial sorting leads to an uneven distribution of people in equilibrium. This is driven by consumers' inclination to co-locate with a certain type of households who are endowed with the commodity they like to consume as is or to be used as an input to produce the commodity they like to consume. Our findings are robust against additional assumptions, including inter-regional trades and portability of endowments.

内藤徹（同志社大学）
"Regional Childcare Policy, Urbanization, and Population Dynamics" (with Hiroyuki Hashimoto)

近藤恵介（神戸大学）
Ex ante evaluation of migration subsidy: Evidence from Japan

中島賢太郎（一橋大学）
Geography of Business Interactions: Evidence from Business Card Exchange Data (with Shinnosuke Kikuchi, Shota Komatsu, Juan Nelson Martinez Dahbura, Takanori Nishida, Kensuke Teshima, and Junichi Yamasaki)

笹原　彰（慶應義塾大学）
"Immigration, imports, and (im)mutable Japanese labor markets." (with Yumin Sui and Emily Taguchi)

＊今回のセミナーは日本貿易振興機構アジア経済研究所との共催です。
This seminar is co-hosted by Institute of Developing Economies, Japan External Trade Organization (JETRO).

Jacques-François Thisse (Université catholique de Louvain、ジェトロ・アジア経済研究所)
"Foundations of Cities" (with Matthew A. Turner and Philip Ushchev)

田所 篤（京都大学）
A welfare analysis of a monocentric city model under monopolistic competition with heterogeneous firms and variable elasticity of substitution preference (with Tadashi Morita and Kazuhiro Yamamoto)

岡本 千草（中央大学）
TBA

菊池 信之介（Massachusetts Institute of Technology）
"The Granular Origins of Agglomeration" with Daniel G O'Connor

内藤 巧（早稲田大学）
"The Small Open Economy in a Generalized Gravity Model" with Svetlana Demidova and Andrés Rodríguez-Clare

菊池 信之介（Massachusetts Institute of Technology）
A few large firms dominate many local labor markets. This leaves workers vulnerable to firm-specific shocks. If one firm has a bad productivity shock in a small market, workers will be stuck with that unproductive employer, while in a large labor market, workers can move to another firm. Building on that insight, we present a model of local labor markets with a finite number of firms subject to idiosyncratic shocks. We show that there are increasing returns to scale which disappear as the number of firms goes to infinity. We also show that there can be under-entry of firms, especially in small markets. We then test the main mechanism in Japanese administrative data. We first confirm that payroll is less volatile in larger, less concentrated local labor markets. We also show that establishments with larger payroll shares respond less in adjusting employment to a demand shock. Finally, we propose a quantitative, granular model of economic geography with free entry of firms and costly mobility of workers across sectors and commuting zones that could be used to quantify the mechanism and do counterfactuals.

内藤 巧（早稲田大学）
To provide sharp answers to basic questions in international trade, a standard approach is to focus on a small open economy (SOE). Whereas the classic tradition is to define a SOE as an economy that takes world prices as given, in the modern trade literature a SOE is defined instead as one that takes foreign-good prices and export demand schedules as given. In this paper we develop a generalized gravity model that nests all of its standard microfoundations (e.g., Armington and Melitz-Pareto) and show how to take the limit so that an economy that becomes infinitesimally small behaves like a SOE. We then show how the resulting model of a SOE can be used to understand comparative statics and the optimal tariff in a way that is robust across the different microfoundations consistent with the gravity model.