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A Mind is a Terrible Thing to Change: Confirmation Bias in Financial Markets

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  • Pouget, Sébastien
  • Villeneuve, Stéphane

Abstract

This paper proposes a dynamic model of financial markets where some investors are prone to the confirmation bias. Following insights from the psychological literature, these agents are assumed to amplify signals that are consistent with their prior views. In a model with public information only, this assumption provides a rationale for the volume-based price momentum documented by Lee and Swaminathan (2000). Our results are also consistent with a variety of other empirically documented phenomena such as bubbles, crashes, reversals and excess price volatility and volume. Novel empirical predictions are derived: i) return continuation should be stronger when biased traders' beliefs are more extreme, and ii) return continuation should be stronger after an increase in trading volume. The implications of our model for short-term quantitative investments are twofold: i) optimal trading strategies involve riding bubbles, and that ii) contrarian trading can be optimal in some market circumstances.

Suggested Citation

  • Pouget, Sébastien & Villeneuve, Stéphane, 2012. "A Mind is a Terrible Thing to Change: Confirmation Bias in Financial Markets," IDEI Working Papers 720, Institut d'Économie Industrielle (IDEI), Toulouse, revised Aug 2016.
  • Handle: RePEc:ide:wpaper:25823
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    1. Weekly Roundup 186: A Curated Linkfest For The Smartest People On The Web!
      by Miguel in Simoleon Sense on 2012-09-16 09:29:18

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    Cited by:

    1. Blanco, Ivan & De Jesus, Miguel & Remesal, Alvaro, 2023. "Overlapping momentum portfolios," Journal of Empirical Finance, Elsevier, vol. 72(C), pages 1-22.
    2. Charness, Gary & Dave, Chetan, 2017. "Confirmation bias with motivated beliefs," Games and Economic Behavior, Elsevier, vol. 104(C), pages 1-23.
    3. Penasse, J.N.G. & Renneboog, L.D.R., 2014. "Bubbles and Trading Frenzies : Evidence from the Art Market," Other publications TiSEM bf0d8984-df7f-4f02-afc7-3, Tilburg University, School of Economics and Management.
    4. Vafaeimehr, Ahmadreza & Schulmerich, Marcus & Paterlini, Sandra, 2023. "Top investment banks, confirmation Bias, and the market pricing of forecast revisions," International Review of Financial Analysis, Elsevier, vol. 88(C).

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    Keywords

    financial markets; psychological biases; confirmation bias; momentum; reversal; bubbles; trading strategies;
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