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Equilibrium Analysis in Overlapping Generations Games

Research Project

Project/Area Number 22K13360
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 07010:Economic theory-related
Research InstitutionTokyo Denki University

Principal Investigator

Morooka Chihiro  東京電機大学, 理工学部, 助教 (90932210)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2023: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2022: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Keywords異時点間の利得移転 / 利得集合の特徴付け / フォーク定理 / 均衡利得の計算手続き / 繰り返しゲーム / 重複世代モデル / 動学的経済分析 / 世代間移転問題 / 均衡の効率性
Outline of Research at the Start

繰り返しゲームのモデルのひとつである、重複世代繰り返しゲーム(Overlapping Generations Games、以下OLGゲーム)は、期間の経過に伴い社員が入れ替わっていく企業の分析などに適したモデルである。申請者はこれまで、プレイヤーの数が少ないOLGゲームでは、通常の繰り返しゲームでは得ることが出来ないような良い結果を実現できることを示した。本研究ではこの結果に基づき、OLGゲームの分析において残された課題の解決を試みる。具体的には、段階ゲームのプレイヤー数が多い場合の分析、利得の厳密な計算方法の定式化、処分可能なあらゆる利得の図示などに関連する研究に取り組む。

Outline of Final Research Achievements

With a foreign researcher, I conducted research on repeated games by overlapping generations of players (OLG games). In particular, we completely characterized the set of feasible payoffs in OLG games. This set becomes a multidimensional polygon, and when calculating it, instead of checking all possible strategies, all we have to do is to consider the sequences of pure strategies that correspond to the vertices of the set. We also showed that the set expands when either the players' discount factor goes to zero or their lifespan becomes longer. We summarized these results in a paper and submitted it to Journal of Mathematical Economics (peer-reviewed) in February 2024.

Academic Significance and Societal Importance of the Research Achievements

上記の成果により、通常の繰り返しゲームとは異なる、OLGゲームに固有の特性が明らかになった。特に、プレイヤーの割引因子が小さくなるほど、処分可能な利得の集合が拡大するという点は、本研究によって詳細に解析された、これまで知られていなかったOLGゲームの大きな特長である。現実社会を見ても、実在する企業その他の組織において、期間の経過に伴いメンバーが次第に入れ替わる構造になっている状況は、数多く存在する。本研究の成果は、このような組織において、構成員がどれだけ協力して組織全体の利益を高められるか、という点に関して、実用的な知見を提供できる可能性がある。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (12 results)

All 2024 2023 2022 Other

All Int'l Joint Research (2 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Open Access: 3 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results) Remarks (1 results)

  • [Int'l Joint Research] 浦項工科大学校(POSTECH)(韓国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] 浦項工科大学校(POSTECH)(韓国)

    • Related Report
      2022 Research-status Report
  • [Journal Article] Characterizing the Feasible Payoff Set of OLG Repeated Games2024

    • Author(s)
      Chihiro Morooka, Daehyun Kim
    • Journal Title

      arXiv

      Volume: -

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Open Access / Int'l Joint Research
  • [Journal Article] A New Folk Theorem in OLG Games2023

    • Author(s)
      Chihiro Morooka
    • Journal Title

      東京電機大学総合文化研究

      Volume: 21 Pages: 71-80

    • Related Report
      2023 Annual Research Report
    • Open Access
  • [Journal Article] A New Folk Theorem in OLG Games2022

    • Author(s)
      Chihiro Morooka
    • Journal Title

      CIRJE Discussion Papers

      Volume: -

    • Related Report
      2022 Research-status Report
    • Open Access
  • [Presentation] Characterizing the Feasible Payoff Set of OLG Repeated Games2023

    • Author(s)
      Chihiro Morooka
    • Organizer
      2023 Africa Meeting of the Econometric Society
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Characterizing the Feasible Payoff Set of OLG Repeated Games2023

    • Author(s)
      Chihiro Morooka
    • Organizer
      2023 Asian Meeting of the Econometric Society
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Characterizing the Feasible Payoff Set of OLG Repeated Games2023

    • Author(s)
      Chihiro Morooka
    • Organizer
      CIRJE Microeconomics Workshop
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] A Folk Theorem for Infinitely Repeated Games with Equivalent Payoffs under Optional Monitoring2022

    • Author(s)
      関口格、諸岡千裕
    • Organizer
      2022年度日本経済学会春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Computing Equilibrium Payoffs in OLG Repeated Games2022

    • Author(s)
      Chihiro Morooka, Daehyun Kim
    • Organizer
      2022 Asian Meeting of the Econometric Society in East and South-East Asia
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Computing Equilibrium Payoffs in OLG Repeated Games2022

    • Author(s)
      諸岡千裕、金大賢
    • Organizer
      2022年度日本経済学会秋季大会
    • Related Report
      2022 Research-status Report
  • [Remarks] 研究者本人に関する所属研究機関のwebページ

    • URL

      https://ra-data.dendai.ac.jp/tduhp/KgApp/k03/resid/S000761

    • Related Report
      2022 Research-status Report

URL: 

Published: 2022-04-19   Modified: 2025-01-30  

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