Research
Published papers
Platform Economics:
Platform Oligopoly with Endogenous Homing: Implications for Mergers and Free Entry (with Takanori Adachi and Mark Tremblay),
Journal of Industrial Economics, December 2023, Vol 71(4) pp1203-1232. [link] [news release]Cournot Platform Competition with Mixed-Homing (with Takanori Adachi and Mark Tremblay),
International Journal of Industrial Organization, December 2023, Vol. 91. [link]Freemium as Optimal Menu Pricing,
International Journal of Industrial Organization, March 2019, Vol. 63, pp480-510. [link]
Regulatory Economics:
Optimal Risk Regulation of Monopolists with Subjective Risk Assessment (with Daiki Kishishita),
Journal of Regulatory Economics, June 2021, Vol. 59, pp251-279. [link]Shadow Cost of Public Funds and Privatization Policies (with Toshihiro Matsumura),
North American Journal of Economics and Finance, November 2019, Vol. 50.[link]Dynamic Privatization Policy (with Toshihiro Matsumura),
The Manchester School, January 2019, Vol. 87, pp37-59. [link]An Analysis of Entry-then-Privatization Model: Welfare and Policy Implications (with Sang-Ho Lee and Toshihiro Matsumura),
Journal of Economics, January 2018, Vol.123(1), pp71-88. [link]
Other Publications (short papers, surveys, and policy papers):
Conflict between Consumer and Worker Surpluses under Monopoly Power
Economics Letters, January 2024, Vol. 234. [link]Relevant Markets and Market Power of Mobile Apps (with Kohei Kawaguchi and Toshifumi Kuroda),
Japan and the World Economy, September 2023, Vol. 67 (virtual special issue on digital platforms and their ecosystems). [link]Self-Preferencing by Platforms: A Literature Review (with Yuta Kittaka and Yusuke Zennyo),
Japan and the World Economy, June 2023, Vol 66, (virtual special issue on digital platforms and their ecosystems). [link]Joint-Purchase Benefits as an Anti-Steering Device of Platforms,
Economics Letters, June 2022, Vol. 215. [link]Market Shares and Profits in Two-Sided Markets,
Economics Letters, October 2021, Vol. 207. [link]Free Entry under Common Ownership (with Toshihiro Matsumura),
Economics Letters, October 2020, Vol. 195. [link]Monopoly Regulation in the Presence of Consumer Demand-Reduction,
Economics Letters, December 2018, Vol. 173, pp61-64. [link]
Working papers
An Empirical Model of Mobile App Competition: The Role of Revenue-Source Channel (with Kohei Kawaguchi and Toshifumi Kuroda),
revision requested at RAND Journal of Economics [PDF]previous title: Merger Analysis in the App Economy: An Empirical Model of Ad-Sponsored Media
presented at NBER SI, TSE Economics of Platforms Seminar
Asymmetric Platform Oligopoly (with Martin Peitz),
revision requested at RAND Journal of Economics [PDF]partly replaces an older paper, "Horizontal Mergers in the Presence of Network Externalities" [PDF]
presented at TSE Economics of Platforms Seminar
Do Agency Contracts Facilitate Upstream Collusion? (with Yoshifumi Hino and Yusuke Zennyo) [PDF]
Dual-Role Platforms and Self-Preferencing: Sequential Search Approach (with Yuta Kittaka) [PDF] [online appendix] [slide]
Product Market Competition, Labor Mobility, and Firm-Sponsored Training: A New Perspective on Market Power (with Arghya Ghosh and Hodaka Morita) [PDF]
Watchdog versus Yes Man: News Source and Media Competition (with Daiki Kishishita) [PDF]
Works in Progress
Competitive Platform Design (with Yusuke Zennyo)
Managerial Human Capital and Internal Labor Market Job Turnover: Evidence from Japanese Business-Card Data (with Masataka Eguchi, Yutaka Kuroki, and Kazuhiro Teramoto)
Oligopoly Pricing with Bundling and Fringe Entry: The Case of Telecommunication Industry (with Takanori Ida, Kohei Kawaguchi, and Toshifumi Kuroda)
project on tariff structure in vertical structure (with Simon Anderson and Yusuke Zennyo)
project on labor market competition in innovative industries (with Mark Tremblay)
Presentation
Jan, 2017: Microeconomics Workshop (at The University of Tokyo)
Jan, 2017: Business Economics, Industrial Organization, and Marketing Workshop (at Nanzan University)
Jun, 2017: Spring Meeting of Japanese Economic Association (at Ritsumeikan University)
Aug, 2017: Industrial Organization and Competition Policy Workshop (at Shinshu University)
Aug, 2017: Osaka Workshop of Institutional and Organizational Economics (at The University of Tokyo)
Oct, 2017: Autumn Meeting of Japan Association for Applied Economics (at Tokai University)
Jan, 2018: Business Economics, Industrial Organization, and Marketing Workshop (at Nanzan University)
Jul, 2018: Economic Theory Workshop (at Hitotsubashi University)
Dec, 2018: Asia-Pacific Industrial Organization Conference (at University of Melbourne)
Jun, 2019: Spring Meeting of Japanese Economic Association (at Musashi University)
Jun, 2019: Spring Meeting of Japan Association for Applied Economics (at Nanzan University)
Aug, 2019: Summer Workshop on Economic Theory (at Otaru Chamber of Commerce & Industry)
Aug, 2019: EARIE Annual Conference (at Barcelona GSE)
Sep, 2019: Meeting for Adaptation to the 4th Industrial Revolution (International Institute for Advanced Studies)
Sep, 2019: Kwansei Gakuin Industrial Organization Workshop (at Kwansei Gakuin University)
Sep, 2019: Industrial Organization and Competition Policy Workshop (at Nagoya University)
Oct, 2019: CPRC seminar (at Japan Fair Trade Commission)
Jan, 2020: Industrial Organization Workshop (Dissertation defense at The University of Tokyo)
Apr, 2020: Bi-Annual Postal Economics Conference (at Toulouse School of Economics, planned) canceled due to COVID-19
Jun, 2020: Economic Theory Workshop (at Hitotsubashi University, online)
Sep, 2020: Happy Hour Seminar! (online)
Oct, 2020: CPRC seminar (at Japan Fair Trade Commission, online)
Mar, 2021: Contract Theory Workshop (online)
Apr, 2021: International Workshop on Oligopoly Theory (at Chonnam National University, online)
May, 2021: 19th Annual International Industrial Organization Conference (at Northeastern University, online)
May, 2021: Spring Meeting of Japanese Economic Association (at Kwansei Gakuin University, online)
Jun, 2021: Industrial Organization Workshop (at The University of Tokyo, online)
Jul, 2021: Workshop on Microeconomics and Game Theory (at Kyoto University, online)
Aug, 2021: 48th EARIE Annual Conference (at NHH Norwegian School of Economics, online)
Oct, 2021: Platform Economics Reading Group (at National University of Singapore, online)
Nov, 2021: Platform Economics Study Group (at METI, online)
Nov, 2021: Seminar at Otaru University of Commerce
Dec, 2021: Asia-Pacific Industrial Organization Conference (at National University of Singapore, online)
Jan, 2022: Platform Economics Study Group (at METI, online)
June, 2022: プラットフォームと流通の研究会 (at Kobe University)
June, 2022: Industrial Organization Workshop (at The University of Tokyo)
July, 2022: Communication and Persuasion Workshop (at Waseda University)
July, 2022: Platform Economics Reading Group (at National University of Singapore, online)
July, 2022: プラットフォームと流通の研究会 (at University of Nagasaki)
Oct, 2022: Workshop on Microeconomics and Game Theory (at Kyoto University)
Nov, 2022: Microeconomics Workshop (at The University of Tokyo)
Nov, 2022: Microeconomics Workshop (at Keio University)
Dec, 2022: NUS Economics of Platforms Workshop (at National University of Singapore)
Feb, 2023: Workshop "Digital Platform and Competition (at Kwansei-Gakuin University)
Sep, 2023: Seminar at HKUST
Sep, 2023: Industrial Organization and Competition Policy Workshop (at Shinshu University)
Sep, 2023: Study Group on Information and Communication Economics (at Ministry of Internal Affairs)
Oct, 2023: Seminar at Nagoya University
Oct, 2023: Seminar at Musashi University
Nov, 2023: Seminar at Tokyo University of Science
Dec, 2023: TSE Online Seminar on the Economics of Platforms (online)
Dec, 2023: Asia-Pacific Industrial Organization Conference (at HKUST)
Jan, 2024: Workshop on Search and Platform (at The Canon Institute for Global Studies)
Mar, 2024: Seminar at Nihon University
June, 2024: Workshop on AI and Platform Economics (at Yonsei University)
Referee experience
Canadian Journal of Economics
Economic Inquiry
Economic Modelling
European Journal of Operations Research
Hitotsubashi Journal of Economics
International Economic Review
International Journal of Economic Theory
International Journal of Industrial Organization
International Review of Economics and Finance
Japanese Economic Review
Journal of Economic Behavior and Organization
Journal of Economics
Journal of Economics and Management Strategy
Journal of Industry, Competition, and Trade
Journal of Institutional and Theoretical Economics
Review of Industrial Organization