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Information revelation in a security market: The impact of uncertain participation

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  • Gabrielle Demange

    (PSE - Paris School of Economics - UP1 - Université Paris 1 Panthéon-Sorbonne - ENS-PSL - École normale supérieure - Paris - PSL - Université Paris Sciences et Lettres - EHESS - École des hautes études en sciences sociales - ENPC - École des Ponts ParisTech - CNRS - Centre National de la Recherche Scientifique - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement, PJSE - Paris-Jourdan Sciences Economiques - ENS-PSL - École normale supérieure - Paris - PSL - Université Paris Sciences et Lettres - INRA - Institut National de la Recherche Agronomique - EHESS - École des hautes études en sciences sociales - ENPC - École des Ponts ParisTech - CNRS - Centre National de la Recherche Scientifique)

Abstract

The paper analyzes how uncertainty on traders' participation affects a competitive security market in which there are some informed traders. We show that discontinuities, or "crashes", can arise at equilibrium, even when no investor posts a priori an increasing demand. Because of uncertain participation, the precision of the information brought by a price is endogenous, affected by the size of the trades. As a result, two prices with different volumes and information revelation may clear the market for the same values of the fundamentals. At one price, insurance motives drive the exchanges, noise is large and little information is revealed. At another price, uninformed trades are small, which makes the clearing price much more informative. This multiplicity of prices with different precision of information generates discontinuities.

Suggested Citation

  • Gabrielle Demange, 2009. "Information revelation in a security market: The impact of uncertain participation," PSE Working Papers halshs-00575046, HAL.
    • Handle: RePEc:hal:psewpa:halshs-00575046
    Note: View the original document on HAL open archive server: https://shs.hal.science/halshs-00575046
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    References listed on IDEAS

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