• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Welfare Evaluation of Public Policy under Imperfect Competition: A Market Power Index Approach

Research Project

Project/Area Number 21K01440
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 07040:Economic policy-related
Research InstitutionKyoto University

Principal Investigator

Adachi Takanori  京都大学, 経営管理研究部, 教授 (50515153)

Project Period (FY) 2021-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2024: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords不完全競争 / 市場支配力 / 価格転嫁 / パススルー / 十分統計量 / 公共政策 / プラットフォーム / 競争政策 / 品質選択 / 寡占 / 厚生分析 / デジタル経済 / 経済厚生 / 帰着 / 公的資金の限界価値 / 市場支配度指数 / 市場支配度指数アプローチ
Outline of Research at the Start

完全競争と独占を二つの両極端として、それらの間に位置する不完全競争的状況一般を全
体的に捉えようとする「市場支配度指数アプローチ」は、従来からのゲーム理論ベースの不
完全競争の定式化とは異なり、戦略的詳細のモデル化をスキップし、不完全競争の程度を
「市場支配度指数パラメータ」と簡便に把握することで、応用的問題の取扱いや実証分析との親和性に優れていると考えられる。そこで本研究においては、同アプローチの今後の更なる進展を目指すため、主に、北米における炭酸飲料水産業の市場環境を念頭に置いて、公共政策・競争政策的視点から、物品税制度の導入・改正や企業結合等の厚生的帰結について理解を進展させることを狙う。

Outline of Final Research Achievements

By conceptualizing perfect competition and monopoly as two polar extremes, this study establishes a comprehensive analytical framework grounded in the "market power index approach," which seeks to capture the broad range of imperfectly competitive market structures situated between these extremes. This framework is fundamentally based on key indicators such as the price elasticity and curvature of demand, through which public policy implications can be systematically examined. A central insight of this approach is the pivotal role played by the concept of pass-through in understanding firm behavior and market outcomes. Moreover, the framework accommodates firm heterogeneity, thereby enhancing its applicability to empirical analysis. Building upon this methodological foundation, the study extends its analysis to include empirical investigations of third-degree price discrimination, considerations of labor and capital markets, and the strategic behavior of platforms in two-sided markets.

Academic Significance and Societal Importance of the Research Achievements

本研究においては、従来、もっぱら一次元的な政策パラメータが設定された上で政策評価分析が行われていた研究状況に対して、より一般的に、多次元の政策パラメータを同時的に扱い、その下での厚生評価の特徴づけが提示された。更に、企業の異質性を許すという意味で、実証分析上、有用となる統一的なフレームワークを提示し、また、公共政策や競争政策が関わる様々な問題に有用なアプローチであることが示された点にその学術的意義がある。このことは、政策評価に関して、誘導的な分析と構造的な分析の中間に位置する「第三の道」を提唱し、政策評価に多様な視点を提示することが可能になるという意味で社会的意義を有するものである。

Report

(5 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (28 results)

All 2025 2024 2023 2022 2021 Other

All Int'l Joint Research (4 results) Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Open Access: 5 results,  Peer Reviewed: 5 results) Presentation (10 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results) Book (3 results) Remarks (4 results)

  • [Int'l Joint Research] ニューヨーク大学(米国)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] ネヴァダ大学(米国)

    • Related Report
      2023 Research-status Report
  • [Int'l Joint Research] マイアミ大学(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] マイアミ大学(米国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Price Elasticity and Pass-Through in the Nash Bargaining Solution in a Common-Retailer Channel2023

    • Author(s)
      Adachi T
    • Journal Title

      The Kyoto Economic Review

      Volume: 197 Issue: 1 Pages: 1-10

    • DOI

      10.57475/keizaironso.197.1.1

    • ISSN
      0013-0273, 2758-3988
    • Year and Date
      2023-02-28
    • Related Report
      2023 Research-status Report
    • Open Access
  • [Journal Article] Platform Oligopoly with Endogenous Homing: Implications for Mergers and Free Entry2023

    • Author(s)
      Takanori Adachi;Susumu Sato;Mark J. Tremblay
    • Journal Title

      Journal of Industrial Economics

      Volume: 71 Issue: 4 Pages: 1203-1232

    • DOI

      10.1111/joie.12345

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Cournot Platform Competition with Mixed-Homing2023

    • Author(s)
      Mark Tremblay;Takanori Adachi;Susumu Sato
    • Journal Title

      International Journal of Industrial Organization

      Volume: 91 Pages: 103002-103002

    • DOI

      10.1016/j.ijindorg.2023.103002

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Sufficient Statistics Approach for Welfare Analysis of Oligopolistic Third‐Degree Price Discrimination2023

    • Author(s)
      Adachi T
    • Journal Title

      International Journal of Industrial Organization

      Volume: 86 Pages: 102893-102893

    • DOI

      10.1016/j.ijindorg.2022.102893

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] <Research Note>Understanding the Role of Competition Policy in a General Equilibrium Model of Imperfect Competition2022

    • Author(s)
      安達貴教
    • Journal Title

      經濟論叢

      Volume: 196 Issue: 3 Pages: 45-54

    • DOI

      10.14989/278431

    • ISSN
      0013-0273
    • Year and Date
      2022-11-30
    • Related Report
      2022 Research-status Report
  • [Journal Article] Pass-Through, Welfare, and Incidence under Imperfect Competition2022

    • Author(s)
      Adachi T; Fabinger M
    • Journal Title

      Journal of Public Economics

      Volume: Forthcoming Pages: 104589-104589

    • DOI

      10.1016/j.jpubeco.2021.104589

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chicago Price Theory Meets Imperfect Competition: A Common Ownership Approach2022

    • Author(s)
      Adachi T; Bao L
    • Journal Title

      Economics Bulletin

      Volume: Forthcoming

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Taxation, Pass-Through, and Incidence under Imperfect Competition with Endogenous Quality Choice2025

    • Author(s)
      Adachi, T.
    • Organizer
      The 6th Joint Economics Symposium of 4 Leading Universities in Taiwan and Japan
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Commodity Taxation, Quality Choice, and Pass-Through under Imperfect Competition2024

    • Author(s)
      安達貴教
    • Organizer
      日本応用経済学会2024年度秋季大会
    • Related Report
      2024 Annual Research Report
  • [Presentation] Commodity Taxation, Quality Choice, and Pass-Through under Imperfect Competition2023

    • Author(s)
      Adachi T
    • Organizer
      National Tax Assocition, 116th Anuual Conference
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Platform Oligopoly with Endogenous Homing: Implications for Mergers and Free Entry2022

    • Author(s)
      安達貴教
    • Organizer
      日本経済学会・2022年度春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Platform Oligopoly with Endogenous Homing: Implications for Mergers and Free Entry2022

    • Author(s)
      Adachi, T.
    • Organizer
      Econometric Society, Asian Meeting
    • Related Report
      2022 Research-status Report
  • [Presentation] Platform Oligopoly with Endogenous Homing: Implications for Mergers and Free Entry2022

    • Author(s)
      安達貴教
    • Organizer
      ワークショップ「マーケティング論・産業組織論・ビジネス経済学」(南山大学経営研究センター)
    • Related Report
      2021 Research-status Report
  • [Presentation] Multi-Dimensional Pass-Through and Welfare Measures under Impefect Competition2021

    • Author(s)
      Adachi T
    • Organizer
      19th Annual International Industrial Organization Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 第3種価格差別研究の過去・現在・未来2021

    • Author(s)
      安達貴教
    • Organizer
      日本応用経済学会・春季大会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Platform Oligopoly with Endogenous Homing: Implications for Mergers and Free Entry2021

    • Author(s)
      安達貴教
    • Organizer
      日本応用経済学会・春季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Platform Oligopoly with Endogenous Homing: Implications for Mergers and Free Entry2021

    • Author(s)
      Adachi T
    • Organizer
      5th Asia-Pacific Industrial Organization Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Book] 21世紀の市場と競争-デジタル経済・プラットフォーム・不完全競争2024

    • Author(s)
      安達貴教
    • Total Pages
      336
    • Publisher
      勁草書房
    • ISBN
      9784326550937
    • Related Report
      2024 Annual Research Report
  • [Book] Recent Advances in the Theory of Third-Degree Price Discrimination: A Nexus to Network Effects, Innovation, and Behavioral Aspects2023

    • Author(s)
      Adachi T; Hashizume R; Ikeda T; Nariu T; Okada T
    • Total Pages
      86
    • Publisher
      Springer
    • ISBN
      9789819932047
    • Related Report
      2023 Research-status Report
  • [Book] データとモデルの実践ミクロ経済学:ジェンダー・プラットフォーム・自民党2022

    • Author(s)
      安達貴教
    • Total Pages
      256
    • Publisher
      慶應義塾大学出版会
    • ISBN
      9784766427974
    • Related Report
      2022 Research-status Report
  • [Remarks] 安達貴教

    • URL

      https://sites.google.com/view/takanoriadachi-japanese/

    • Related Report
      2024 Annual Research Report 2022 Research-status Report
  • [Remarks] Takanori Adachi's Research

    • URL

      https://sites.google.com/site/takanoriadachi/home/research

    • Related Report
      2023 Research-status Report
  • [Remarks] 「デジタルプラットフォーム分析の新しい枠組み」(京都大学「最新の研究成果を知る」)

    • URL

      https://www.kyoto-u.ac.jp/ja/research-news/2023-11-21-0

    • Related Report
      2023 Research-status Report
  • [Remarks] Takanori Adachi, Research

    • URL

      https://sites.google.com/site/takanoriadachi/home/research

    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-04-28   Modified: 2026-01-16  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi