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Équilibres multiples et volatilité boursière

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  • Édouard Challe

Abstract

[fre] Cet article a pour objet de présenter, de manière synthétique et didactique, les contributions scientifiques ayant pour objet d'expliquer l'instabilité des cours boursiers en termes de multiplicité d'équilibres. Selon cette approche, la volatilité boursière résulte en partie des sauts d'un équilibre d'anticipations rationnelles à un autre, sauts qui peuvent être entièrement déconnectés des fondamentaux de l'économie et donc purement auto-réalisateurs. On commence par introduire les trois formes de multiplicité d'équilibres ainsi utilisées dans les modèles dynamiques (défauts de coordination, bulles rationnelles, indétermination de l'équilibre), pour ensuite présenter et évaluer leurs applications en matière d'évaluation d'actifs et de volatilité boursière. . Classification JEL : D84, E44, G12 [eng] Multiple equilibria and stock-market volatility . This paper surveys explanations of stock-market volatility based on multiple equilibria. This approach emphasises jumps from one equilibrium to the next as a major source of endogenous stock-market fluctuations. As those jumps are essentially disconnected from market fundamentals, they reflect the purely self-fulfilling nature of expectations formed by market participants. The paper starts by introducing the three forms of equilibrium multiplicity commonly used by macroeconomists (« coordination failures », « rational bubbles » and « steady state indeterminacy »), and then go on presenting and assessing their applications in the field of asset pricing. . JEL classification : D84, E44, G12

Suggested Citation

  • Édouard Challe, 2004. "Équilibres multiples et volatilité boursière," Revue d'Économie Financière, Programme National Persée, vol. 74(1), pages 105-123.
  • Handle: RePEc:prs:recofi:ecofi_0987-3368_2004_num_74_1_5034
    DOI: 10.3406/ecofi.2004.5034
    Note: DOI:10.3406/ecofi.2004.5034
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    References listed on IDEAS

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    Cited by:

    1. Jean-Paul Pollin, 2004. "Finance comportementale et volatilité," Revue d'Économie Financière, Programme National Persée, vol. 74(1), pages 139-156.

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    More about this item

    JEL classification:

    • D84 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Expectations; Speculations
    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • D84 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Expectations; Speculations
    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates

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