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Asymétrie d’information et marchés financiers : une synthèse de la littérature récente

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  • Biais, Bruno

    (Département Finance-Économie, Groupe HEC, France)

  • Foucault, Thierry

    (Département Finance-Économie, Groupe HEC, France)

Abstract

The impact of different hypotheses on the existence and informativeness of rational expectations equilibria is analyzed within a simple synthetic model. The case of perfect competition is first analyzed (Grossman and Stiglitz, 1980). Second imperfect competition with exogenous noise trading is studied (KyIe 1985, 1989). Informational efficiency is lower than in the previous case, because of the strategic behaviour of the insider. Third, imperfect competition without noise trader, but with unknown random endowments of the informed agent is analyzed (Glosten, 1989; Bhattacharya and Spiegel, 1990; Bossaerts and Hughson, 1991). In contrast with the previous case, equilibrium exists only if there is enough noise. Cet article est une synthèse des recherches récentes en matière d’asymétrie d’informations sur les marchés financiers. L’impact de différentes hypothèses sur l’existence et l’efficience informationnelle des équilibres est étudié. Le cas de la concurrence parfaite est d’abord analysé (Grossman et Stiglitz, 1980). Puis la concurrence imparfaite est analysée. On distingue deux cas, selon que le bruit qui empêche le prix d’être parfaitement révélateur provient d’une offre exogène (KyIe, 1985, 1989), ou d’une dotation aléatoire des agents informés (Glosten, 1989; Bhattacharya et Spiegel, 1990; Bossaerts et Hughson, 1991). Dans le premier cas, l’équilibre existe toujours. Dans le second cas, il n’existe que si le bruit est assez élevé ou si le support de sa distribution est borné.

Suggested Citation

  • Biais, Bruno & Foucault, Thierry, 1993. "Asymétrie d’information et marchés financiers : une synthèse de la littérature récente," L'Actualité Economique, Société Canadienne de Science Economique, vol. 69(1), pages 8-44, mars.
    • Handle: RePEc:ris:actuec:v:69:y:1993:i:1:p:8-44
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