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Construction of a new decision model under ambiguity and its application to asset valuation

Research Project

Project/Area Number 17K03825
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Money/ Finance
Research InstitutionKyoto Sangyo University

Principal Investigator

IWAKI Hideki  京都産業大学, 経営学部, 教授 (40257647)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords不確実性 / 曖昧性 / 意思決定 / 保険料計算原理 / 均衡資産価格 / ポートフォリオ選択 / Knight的不確実性 / 資産選択 / 不確実性下での意思決定 / 不確実な確率を伴う期待効用 / 不確実性下の意思決定 / EUUP / 非期待効用 / 経済均衡 / ファントム意思決定モデル / 資産価格評価 / 保険プレミアム / リスク・シェアリング / 滑らかな曖昧性モデル / 曖昧性下の意思決定 / リスク評価 / 資産評価と資産選択 / 保険
Outline of Final Research Achievements

1. We have extended the existing economic premium principle of insurance under risk to the more realistic premium principle under ambiguity using the dual theory of the smooth ambiguity model. 2. We have considered the effect of ambiguity on decision making under phantom decision theory, which expresses ambiguity using a phantom probability space in which the probability value takes any value within a certain real interval. Then, we have derived sufficient conditions such that the phantom uncertainty and the change in attitude toward it increase or decrease asset demands. 3. Under the assumption that the decision maker's preference for ambiguity is expressed based on the dual theory of the smooth ambiguity model, we have derived an equilibrium asset pricing model under ambiguity and showed the existence and uniqueness of the equilibrium price. 4. We have derived a measure to measure the degree of ambiguity in the theory of expected utility with uncertain probability.

Academic Significance and Societal Importance of the Research Achievements

保険料原理を曖昧性下に拡張したことは保険料が割高といった現実現象の理論的説明をもたらし、現象解明の礎を与える。また、曖昧性下での新たな意思決定モデルに基づき、曖昧性の大きさを測る尺度を考案し、曖昧性の大きさと曖昧性に対する個人の態度の変化が資産需要と資産価格に与える影響を考察した成果は、実際に観測される株式のリスクプレミアムの乖離が従来の経済学で標準的に用いられているモデルでは説明できないというエクイティプレミアムパズルの問題や人々は、保有資産について、その価値が上昇した場合と比べて下落した場合には、保有資産の売却を行わないという気質効果に対して説明を与えるものとして意義がある。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (15 results)

All 2020 2019 2018 2017 Other

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (9 results) (of which Int'l Joint Research: 8 results) Remarks (2 results)

  • [Journal Article] An Ambiguity Measure under EUUP and Its Application to a Portfolio Problem2020

    • Author(s)
      Hideki Iwaki
    • Journal Title

      Journal of Mathematical Finance

      Volume: ー

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] An Equilibrium Asset Pricing Model under the Dual Theory of the Smooth Ambiguity Model2018

    • Author(s)
      Iwaki Hideki
    • Journal Title

      Journal of Mathematical Finance

      Volume: 08 Issue: 02 Pages: 497-515

    • DOI

      10.4236/jmf.2018.82031

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] AN ECONOMIC PREMIUM PRINCIPLE UNDER THE DUAL THEORY OF THE SMOOTH AMBIGUITY MODEL2017

    • Author(s)
      藤井陽一朗、岩城秀樹、尾崎祐介
    • Journal Title

      ASTIN Bulletin: The Journal of the IAA

      Volume: 47 Issue: 3 Pages: 787-801

    • DOI

      10.1017/asb.2017.14

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Comparative statics and portfolio choices under the phantom decision model2017

    • Author(s)
      岩城秀樹、尾崎祐介
    • Journal Title

      Journal of Banking & Finance

      Volume: 84 Pages: 1-8

    • DOI

      10.1016/j.jbankfin.2017.07.001

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] The Disposition Effect under the Reference Dependent Smooth Model of Ambiguity.2020

    • Author(s)
      Hideki Iwaki
    • Organizer
      The 7th East Asia Risk Management and Insurance Workshop.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] An Ambiguity Measure under EUUP and Its Application to a Portfolio Problem.2019

    • Author(s)
      Hideki Iwaki
    • Organizer
      9 th INTERNATIONAL CONFERENCE FINANCIAL ENGINEERING AND BANKING SOCIETY
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Disposition Effect under the Reference Dependent Smooth Model of Ambiguity.2019

    • Author(s)
      岩城秀樹
    • Organizer
      日本保険・年金リスク学会 研究発表大会(2019)
    • Related Report
      2019 Annual Research Report
  • [Presentation] An Ambiguity Measure under EUUP and Its Application to a Portfolio Problem2019

    • Author(s)
      岩城秀樹
    • Organizer
      The 6th East Asia Risk Management and Insurance Workshop
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] An Ambiguity Measure under EUUP and Its Application to a Portfolio Problem2018

    • Author(s)
      岩城秀樹
    • Organizer
      45th Annual Seminar of the European Group of Risk and Insurance Economists
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Risk Exchange under EUUP2018

    • Author(s)
      岩城秀樹
    • Organizer
      22nd Annual Conference of the Asia-Pacific Risk and Insurance Association
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] An economic premium principle under EUUP2018

    • Author(s)
      岩城秀樹
    • Organizer
      5th East-Asia Risk Management and Insurance Workshop
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Risk Exchange under EUUP2018

    • Author(s)
      岩城秀樹
    • Organizer
      APRIA 2018 Annual Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Comparative statics and portfolio choices under the phantom decision model2017

    • Author(s)
      岩城秀樹
    • Organizer
      24th Annual Conference of the Multinational Finance Society
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Remarks] Risk Exchange under EUUP

    • URL

      https://www.youtube.com/watch?v=GBAW1DaQ4yU&t=135s

    • Related Report
      2018 Research-status Report
  • [Remarks] Risk Exchange under EUUP

    • URL

      https://blogs.ntu.edu.sg/nbsfrmi/2018/08/23/risk-exchange-under-euup/

    • Related Report
      2018 Research-status Report

URL: 

Published: 2017-04-28   Modified: 2021-02-19  

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