Details of the Researcher

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Ryo Itoh
Section
Graduate School of Information Sciences
Job title
Associate Professor
Degree

  • 博士（情報科学） (Tohoku University)

Professional Memberships 3

  • 日本不動産学会

    2011/06 - Present

  • 日本経済学会

    2006 - Present

  • 応用地域学会

    2003 - Present

Research Interests 1

  • Regional and urban economics

Research Areas 1

  • Humanities & social sciences / Theoretical economics /

Papers 17

  1. <p><span>Information Boundaries for Welfare Evaluation Under Unobserved Endogenous Product Quality: A Sufficient Statistics Approach</span></p>

    Ryo Itoh

    2026

    DOI： 10.2139/ssrn.7039298 　

  2. Sufficient Statistics for Welfare with Unobserved Quality: Why Missing Sectional Demand Leads to First-order Errors

    Ryo Itoh

    2026

    DOI： 10.2139/ssrn.6305018 　

  3. Intergenerational assimilation of minorities: The role of the majority group

    Ryo Itoh, Yasuhiro Sato, Yves Zenou

    European Economic Review　2024/05

    DOI： 10.1016/j.euroecorev.2024.104722 　

  4. Shipping alliances under an unexpected shock: Effects on market volatility and social welfare

    Ryo Itoh, Anming Zhang

    Transportation Research Part A: Policy and Practice　2023/12

    DOI： 10.1016/j.tra.2023.103886 　

  5. JUE Insight: The impact of the school admission restriction policy on the housing market in Shanghai

    Kangzhe Ding, Ryo Itoh

    Journal of Urban Economics　2023/07

    DOI： 10.1016/j.jue.2023.103568 　

  6. How should ports share risk of natural and climate change disasters? Analytical modelling and implications for adaptation investments

    Ryo Itoh, Anming Zhang

    Economics of Transportation　2023/03

    DOI： 10.1016/j.ecotra.2023.100301 　

  7. Shipping Alliances and Market Volatility Under an Unexpected Shock

    Ryo Itoh, Anming Zhang

    2023

    DOI： 10.2139/ssrn.4464511 　

  8. Influence of trip distance and population density on intra-city mobility patterns in Tokyo during COVID-19 pandemic

    Kazufumi Tsuboi, Naoya Fujiwara, Ryo Itoh

    PLOS ONE　17　(10)　e0276741-e0276741　2022/10/28

    Publisher: Public Library of Science (PLoS)

    DOI： 10.1371/journal.pone.0276741 　

    eISSN： 1932-6203

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    This study investigates the influence of infection cases of COVID-19 and two non-compulsory lockdowns on human mobility within the Tokyo metropolitan area. Using the data of hourly staying population in each 500m×500m cell and their city-level residency, we show that long-distance trips or trips to crowded places decrease significantly when infection cases increase. The same result holds for the two lockdowns, although the second lockdown was less effective. Hence, Japanese non-compulsory lockdowns influence mobility in a similar way to the increase in infection cases. This means that they are accepted as alarm triggers for people who are at risk of contracting COVID-19.

  9. An interregional input–output analysis with the Eaton–Kortum model

    Ryo Itoh, Kiyoshi Yonemoto

    Economic Systems Research　1-26　2022/05/01

    DOI： 10.1080/09535314.2022.2068407 　

    ISSN： 0953-5314

    eISSN： 1469-5758

  10. Effects of dual networks on tax strategies: geography and transaction

    Ryo Itoh, Zonghui Li

    The Japanese Economic Review　72　(1)　97-128　2021/01

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s42973-020-00060-w 　

    ISSN： 1352-4739

    eISSN： 1468-5876

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    <title>Abstract</title>This study investigates how a revenue-maximizing tax strategy of local and central governments incorporates dual networks, namely, an inter-firm transaction network and an inter-country geography network. We assume a two-stage game in which governments propose discriminatory tax levels for firms, whereas each firm has an incentive to invest in a country near the foreign branch office of its transaction partner. In our model, the centrality index of the Kronecker product of the two networks describes the interplay among the location choices and tax strategies in the equilibrium. A stronger linkage within each network generally increases demand for investment and in turn raises overall tax levels to exploit the high demand. Although more central firms in the inter-firm network are likely to be levied higher taxes because of their high demand for investment, firms in the highest tax bracket differ among countries depending on their geographical location. Finally, we show that a uniform tax in which firms are not discriminated and networks do not matter is the socially optimal tax, which incorporates all inter-country externalities. We also investigate decentralized tax strategies based on the rule of non-discriminatory (uniform) taxation and show, by comparing social welfare under discriminatory and uniform tax regimes, that restricting tax discrimination improves social welfare.

  11. Do sourcing networks make firms global? Microlevel evidence from firm-to-firm transaction networks

    Ryo Itoh, Kentaro Nakajima

    The Japanese Economic Review　72　(1)　65-96　2021/01

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s42973-020-00061-9 　

    ISSN： 1352-4739

    eISSN： 1468-5876

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    <title>Abstract</title>This study investigates how the structure of a domestic firm-to-firm transaction network influences the foreign direct investment (FDI) decisions of embedded firms in the network. We theoretically describe firms’ FDI decisions using an incomplete information game that considers the firm-to-firm transactions of intermediate inputs and in which firms have an incentive to collocate with their trading partners in foreign markets. We show that the probability of a firm engaging in FDI increases with its Katz–Bonacich centrality, which is defined as aggregated accessibility to all other firms and represents expected profit gained from colocation with its partners. We empirically show that this prediction is supported using disaggregated inter-firm transaction network data on Japanese firms. We also extended both theoretical and empirical frameworks to consider the dynamic aspect of FDI. When we consider existing foreign affiliates, accessibility to prior investors in the transaction network, named Katz–Bonacich accessibility, positively influences FDI as well as Katz–Bonacich centrality.

  12. Is transportation infrastructure cost recoverable under the risk of disasters?

    Ryo Itoh

    Transportation Research Part A: Policy and Practice　118　457-465　2018/12

    Publisher: Elsevier BV

    DOI： 10.1016/j.tra.2018.09.014 　

    ISSN： 0965-8564

  13. Tax discrimination against inter-firm networks Peer-reviewed

    Ryo Itoh

    REGIONAL SCIENCE AND URBAN ECONOMICS　49　25-35　2014/11

    DOI： 10.1016/j.regsciurbeco.2014.07.011 　

    ISSN： 0166-0462

    eISSN： 1879-2308

  14. Estimating the Willingness to Pay of Industrial Firms for Japanese Industrial Parks Peer-reviewed

    Ryo Itoh

    Urban Studies　50　(13)　2753-2765　2013/10

    DOI： 10.1177/0042098012474700 　

    ISSN： 0042-0980 1360-063X

  15. Regional income disparities in an OLG structure Peer-reviewed

    Ryo Itoh

    ANNALS OF REGIONAL SCIENCE　50　(1)　185-202　2013/02

    DOI： 10.1007/s00168-011-0489-6 　

    ISSN： 0570-1864

  16. ECONOMIC DEVELOPMENT AND NON-MONOTONIC SPATIAL TRANSITIONS Peer-reviewed

    Ryo Itoh

    JAPANESE ECONOMIC REVIEW　61　(2)　234-251　2010/06

    DOI： 10.1111/j.1468-5876.2009.00479.x 　

    ISSN： 1352-4739

  17. Dynamic control of rural-urban migration Peer-reviewed

    Ryo Itoh

    JOURNAL OF URBAN ECONOMICS　66　(3)　196-202　2009/11

    DOI： 10.1016/j.jue.2009.07.001 　

    ISSN： 0094-1190

    eISSN： 1095-9068

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Misc. 2

  1. 地域間の輸送整備が所得格差に与える影響

    伊藤 亮

    応用地域学研究　No.11 pp13-26　(11)　13-26　2006

    Publisher: 応用地域学会

    ISSN： 1880-960X

  2. 都市間通勤によるベッドタウン形成過程

    応用地域学研究　No.9(2) pp15-2　2005

Research Projects 13

  1. 企業間ネットワークが空間立地に与える影響 Competitive

    System: The Other Research Programs

    2012/04 - Present

  2. Design of public transport system with participation of multiple players

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Doshisha University

    2024/04/01 - 2028/03/31

  3. 産業間取引を考慮した一般均衡モデルによる分権的政策競争の定量的分析

    伊藤 亮, 米本 清

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2022/04/01 - 2026/03/31

  4. Design of mass transit system and urban land use control

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Kyoto University

    2020/04/01 - 2024/03/31

  5. Exploring the Agglomeration Mechanisms in Spatial Economics and Their Applications

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2020/04/01 - 2024/03/31

  6. 民営化された交通市場において災害対策投資を最適化するメカニズムの研究

    伊藤 亮

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 国際共同研究加速基金(国際共同研究強化(A))

    Institution: 東北大学

    2022 - 2024

  7. Theoretical study of decentralized development of infrastructure by local governments

    Itoh Ryo

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2018/04/01 - 2022/03/31

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    We investigated decision making for investment in infrastructure to avoid the risk of natural disasters in the transportation sector, and designed a system to optimize the investment. As a result of an analysis focusing on the independence of natural disasters and risk sharing between infrastructures, if the disaster is widespread and the spatial independence is low (e.g., climate change), investment by a private company Is less than public investment, but spatially local ones (earthquakes, etc.) have the opposite tendency. We have also developed a model for welfare analysis in which the effects of transportation infrastructure investment spread to the entire economy through interregional intermediate material transactions. As a result of applying a linear approximation method based on the latest nonlinear international trade model, an induction system similar to the Leontief inverse matrix was obtained.

  8. Study of secondary employment in a metropolitan area and its structural transition based on micro-zone cohort analysis

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2017/04/01 - 2021/03/31

  9. The Impact Analysis of Spatial Heterogeneity in Spatial Economics and Its Reflection on Policies

    Zeng Dao-Zhi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2017/04/01 - 2021/03/31

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    This project built some new theoretical frameworks and conducted empirical studies of spatial economics including firm heterogeneity and country/region/city heterogeneity. More specifically, we analyzed gains from trade considering capital mobility and disclosed the economic mechanism for countries to change their parallel import policies. We have made substantial progress in analyzing the relationship between agglomeration and trade in intermediate goods. We revealed how regional governments make good policies to develop their regions by attracting good firms. Finally, we examined the optimal capital tax, optimal property tax, and other related policies considering consumer heterogeneity and differences across and within cities.

  10. Theoretical and empirical analysis on the structure of transport costs

    Mun Se-il

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Kyoto University

    2016/04/01 - 2020/03/31

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    Transport costs are essential in the process of transactions for economic activities, such as production and consumption. Transport cost has been treated as an exogenously given parameter in studies of urban economics, spatial economics, and international economics. We construct theoretical models of transportation market, in which transport cost is endogenously determined. We investigate the structure of the transport cost empirically. This project deals with the following 4 subjects: (A) Theoretical model of transport market with shippers and transport firms; (B) Transport cost determined by network strategies of carriers; (C) Transport cost determined by infrastructure policies of governments; (D) Empirical analysis of transport cost.

  11. A theoretical and empirical analysis of network structure on forming agglomeration

    Itoh Ryo

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (B)

    2012/04/01 - 2016/03/31

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    This study examines how structure of inter-firm network influences location and agglomeration of firms. Using location choice game of firms embedded in transaction network, we show a theoretical result that firms with higher Katz-Bonacich centrality agglomerate in higher probability. We also show an empirical evidence supporting this theoretical insight from the data of inter-firm transaction and foreign direct investment of more than 100,000 firms in Japanese manufacturing sector. Further, we also investigate international tax competition for attracting firm in transaction network, and obtain a theoretical result that reginal governments will offer lower tax to firms with higher centrality.

  12. The theoretical and empirical research on land use that included the land use externality between multiple land use

    TAKUMA FUMIO, ANDO Asao, ASADA Yoshihisa, ITO Ryo, SHIMIZU Chika

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Meikai University

    2011/04/01 - 2015/03/31

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    Considering that (i)the supply and demand relationship with land-use conversion between adjacent zoning, and (ii)the impact of land use externalities brings to the adjacent zoning, and this study propose a framework for analyzing the land use policies. For this reason, we extend the Alonso model and developed a metropolitan area model that included the land market consisting of multiple zoning. In addition, we estimated the several types of land use externalities. We presented a framework for numerical analysis analysis of the land use policy.

  13. 労働者の実質賃金格差の空間の分布に関する研究

    伊藤 亮

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究員奨励費

    Institution: 東北大学

    2006 - 2007

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    本年度は昨年に引き続き論文「Economic development and non-monotonic spatial transitions」の修正を行った.本論文は、完全予見の下での家計の人的資本蓄積と地域間移動を分析した、2地域の動学モデルである。既存の動的人口移動モデルでは考慮されていなかった、内生的な人的資本形成をモデルに導入することでモデルの動学的側面を強化し、地域間格差と人口移動を、経済発展と関連付けて分析することを可能とした点である。本論文では地域間における移住費用の水準が、経済発展に伴う人口移動の過程に与える影響に焦点を当てて分析を行った結果、既存研究とは異なった結果が幾つか導出されている。第一に、本研究では移住費の水準が十分に低い場合には、一度過度の人口集中が起こり、その後人口の分散が緩やかに進行するという"逆U字型"の人口移動が得られた。第二に、本研究は家計の人的資本水準を内生化し、それが集積の経済による影響を受けるため、人的資本水準の格差に基づく地域間の経済格差を、モデルの中で内生的に説明することが可能となった。そして実質的な地域間格差の時間的推移を移住費の水準と関連付けて分析した結果、移住費が中間的な水準にある場合に、地域間格差が発展の初期段階で拡大し、その後縮小するという、逆U字型の推移を行うという結果が得られた。本論文は、日本経済学会春季大会、東北大学現代経済学ワークショップ、北米地域学会で報告し、加筆修正した後に、The Japanese Economic Reviewに投稿中である。

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