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Les marchés financiers sont-ils rationnels ?

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  • André Orléan

Abstract

Due to the recent stock market crises, many economists have been keeping aloof from the « core» of financial theory, whose main contention is that stock market prices are at any moment the best possible estimate of the « true» value of the issuing firms. Most of those economists have brought forward, in a way or another, the hypothesis that markets suddenly get crazy. This contribution, based on both observa~tion of the recent financial history (the crash of the « New Economy» securities) and results from « experimental economics», and using the complementary concepts of « mimicry» and « convention » to account for « self-referential dynamics», is opening a third way of thinking the efficiency problematic: investors fix their strategy based on the estimates of the other participants, even if they strongly believe they are wrong.

Suggested Citation

  • André Orléan, 2004. "Les marchés financiers sont-ils rationnels ?," Reflets et perspectives de la vie économique, De Boeck Université, vol. 0(2), pages 35-41.
  • Handle: RePEc:cai:rpvedb:rpve_432_0035
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    References listed on IDEAS

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    1. Lei, Vivian & Noussair, Charles N & Plott, Charles R, 2001. "Nonspeculative Bubbles in Experimental Asset Markets: Lack of Common Knowledge of Rationality vs. Actual Irrationality," Econometrica, Econometric Society, pages 831-859.
    2. Charles Noussair & Stephane Robin & Bernard Ruffieux, 2001. "Price Bubbles in Laboratory Asset Markets with Constant Fundamental Values," Experimental Economics, Springer;Economic Science Association, vol. 4(1), pages 87-105, June.
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    Cited by:

    1. Delphine Van Hoorebeke, 2013. "Une vision de la prise de décision rationnelle et irrationnelle, un construit individuel et collectif," CIRANO Working Papers 2013s-13, CIRANO.

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