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

Imperfect information and sunspot equilibria in a reasonable framework of expectations

Research Project

Project/Area Number 20K01556
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 07010:Economic theory-related
Research InstitutionKansai University

Principal Investigator

Nakagawa Ryuichi  関西大学, 経済学部, 教授 (60309614)

Project Period (FY) 2020-04-01 – 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 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords適応的学習 / サンスポット均衡 / 情報の不完全性 / 期待の安定性 / 金融政策 / 期待形成の摩擦 / 期待の異質性 / 均衡の安定性 / インフレーションターゲティング / 流動性の罠 / インフレーションターゲッティング / 金融危機
Outline of Research at the Start

本研究は、現実の期待形成として「適応的学習」(adaptive learning)を想定し、代表的な経済攪乱の概念である「サンスポット均衡」のメカニズムを明らかにする。2020年度には、情報の不完全性とサンスポット均衡の安定性との関係を明らかにする(テーマⅠ)。2021年度には、情報不完全性の「程度」の時間的な変化とサンスポット均衡の発生・崩壊過程(boom-bust cycles)の関係を明らかにする(テーマⅡ)。2022年度には、サンスポット均衡の発生を防ぐための金融政策のあり方を明らかにする(テーマⅢ)。2023年度には、2000年代後半以降の経済攪乱の構造を明らかにする(テーマⅣ)。

Outline of Final Research Achievements

This research investigated the impact of information imperfection under adaptive learning on the mechanism of sunspot equilibria. First, we demonstrated theoretically that information imperfection enhances the stability of sunspot equilibria. Next, we showed that imperfect information of structural shocks leads to the onset of sunspot equilibria, and their processes are consistent with recent financial fluctuations. In addition, we found that the active nominal interest rate rule of monetary policy is effective for controlling those fluctuations. Finally, we empirically confirmed these mechanisms with economic data.

Academic Significance and Societal Importance of the Research Achievements

第1に、適応的学習の枠組みで「情報の不完全性」を想定し、2000年代の経済攪乱に近い経済環境のもとでサンスポット均衡のメカニズムを明らかにしたことである。第2に、情報の不完全性が生み出す「期待形成の摩擦」の効果を定式化することによって、従来の合理的期待の枠組みにはない情報の不完全性の効果を明らかにしたことである。第3に、「金融摩擦」など先行研究が注目する経路とは異なる経路を通じて、情報の不完全性と攪乱的景気循環との関係を明らかにし、2000年代末の世界金融危機のみならず金融破綻等とは関係の無い過去の経済攪乱の仕組みもまた明らかにしたことである。

Report

(6 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (16 results)

All 2024 2022 2021 Other

All Int'l Joint Research (5 results) Journal Article (8 results) (of which Open Access: 8 results,  Peer Reviewed: 1 results) Presentation (3 results)

  • [Int'l Joint Research] University of Oregon(米国)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] University of Oregon(米国)

    • Related Report
      2023 Research-status Report
  • [Int'l Joint Research] University of Oregon(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] University of Oregon(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Oregon(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] 物価の社会規範と流動性の罠の安定性2024

    • Author(s)
      中川竜一
    • Journal Title

      関西大学経済学会ワーキングペーパーシリーズ

      Volume: J-63 Pages: 1-15

    • Related Report
      2024 Annual Research Report
    • Open Access
  • [Journal Article] Inflation targeting, expectations formation, and macroeconomic stability2024

    • Author(s)
      Ryuichi Nakagawa
    • Journal Title

      Social Science Research Network

      Volume: 4859672 Pages: 1-36

    • DOI

      10.2139/ssrn.4859672

    • Related Report
      2024 Annual Research Report
    • Open Access
  • [Journal Article] Inflation targeting, anchoring of expectations, and the stability of liquidity trap2024

    • Author(s)
      Ryuichi Nakagawa
    • Journal Title

      Economic Society of Kansai University Working Paper Series

      Volume: F-106 Pages: 1-28

    • Related Report
      2024 Annual Research Report
    • Open Access
  • [Journal Article] 流動性の罠の安定性と物価の社会規範2024

    • Author(s)
      中川竜一
    • Journal Title

      『大銀協フォーラム研究助成論文集』

      Volume: 28 Pages: 1-18

    • Related Report
      2023 Research-status Report
    • Open Access
  • [Journal Article] Inflation targeting, expectations formation, and macroeconomic stability2022

    • Author(s)
      Ryuichi Nakagawa
    • Journal Title

      RISS Discussion Paper Series

      Volume: 104 Pages: 1-38

    • Related Report
      2022 Research-status Report
    • Open Access
  • [Journal Article] Inflation targeting, expectations formation, and macroeconomic stability2022

    • Author(s)
      Ryuichi Nakagawa
    • Journal Title

      Economic Society of Kansai University Working Paper Series

      Volume: F-100 Pages: 1-30

    • Related Report
      2021 Research-status Report
    • Open Access
  • [Journal Article] Bank herding in loan markets: Evidence from geographical data in Japan2021

    • Author(s)
      Ryuichi Nakagawa
    • Journal Title

      International Review of Finance

      Volume: n/a Issue: 1 Pages: 1-18

    • DOI

      10.1111/irfi.12341

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bank Herding, Size, and Financial Health: Evidence from Japanese Regional Banks2021

    • Author(s)
      Ryuichi Nakagawa
    • Journal Title

      SSRN Electronic Journal

      Volume: n/a Pages: 1-19

    • DOI

      10.2139/ssrn.3767260

    • Related Report
      2020 Research-status Report
    • Open Access
  • [Presentation] Inflation targeting, anchoring of expectations, and the stability of liquidity trap2024

    • Author(s)
      Ryuichi Nakagawa
    • Organizer
      財団法人ゆうちょ財団 第18回研究助成論文報告会
    • Related Report
      2024 Annual Research Report
  • [Presentation] 流動性の罠の安定性と物価の社会規範2024

    • Author(s)
      中川 竜一
    • Organizer
      関西大学経済学会 第40回夏季研究大会
    • Related Report
      2024 Annual Research Report
  • [Presentation] Inflation targeting, expectations formation, and the stability of REE2022

    • Author(s)
      Ryuichi Nakagawa
    • Organizer
      日本経済学会2022年度春季大会(横浜国立大学)
    • Related Report
      2022 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2026-01-16  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi