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Trading ambiguity: a tale of two heterogeneities

Author

Listed:
  • Sujoy Mukerji

    (QMUL - Queen Mary University of London)

  • Han N Ozsoylev

    (Özyeğin University)

  • Jean‐marc Tallon

    (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 - 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)

Abstract
We consider nancial markets with heterogeneously ambiguous assets and heterogeneously ambiguity averse investors. Investors' preferences, a version of the smooth ambiguity model, are a parsimonious extension of the standard mean-variance framework. We consider, in a uni ed setting, portfolio choice, and trade upon arrival of public information, and show, in both cases, there are systematic departures from the predictions of standard theory. These departures are of signi cance as they occur in the direction of empirical regularities that belie the standard theory. In particular, our theory speaks to several puzzling phenomena in a uni ed fashion: the asset allocation puzzle, the observation that earnings announcements are often followed by signi cant trading volume with small price change, and that increases in uncertainty are positively associated with increased trading activity and portfolio rebalancing toward safer assets by individual (retail) investors

Suggested Citation

  • Sujoy Mukerji & Han N Ozsoylev & Jean‐marc Tallon, 2023. "Trading ambiguity: a tale of two heterogeneities," PSE-Ecole d'économie de Paris (Postprint) halshs-03962563, HAL.
    • Handle: RePEc:hal:pseptp:halshs-03962563
    DOI: 10.1111/iere.12627
    Note: View the original document on HAL open archive server: https://shs.hal.science/halshs-03962563
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