Follies subdued: Informational efficiency under adaptive expectations and confirmatory bias

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Abstract

We study the informational efficiency of a market with a single traded asset. The price initially differs from the fundamental value, about which the agents have noisy private information (which is, on average, correct). A fraction of traders revise their price expectations in each period. The price at which the asset is traded is public information. The agents' expectations have an adaptive component and a social-interactions component with confirmatory bias. We show that, taken separately, each of the deviations from rationality worsens the informational efficiency of the market. However, when the two biases are combined, the degree of informational inefficiency of the market (measured as the deviation of the long-run market price from the fundamental value of the asset) can be non-monotonic both in the weight of the adaptive component and in the degree of confirmatory bias. For some ranges of parameters, two biases tend to mitigate each other's effect, thus increasing informational efficiency.
Original languageEnglish
Pages (from-to)110-121
Number of pages12
JournalJournal of Economic Behavior and Organization
Volume80
DOIs
Publication statusPublished - 1 Sep 2011

Keywords

  • asset pricing
  • confirmatory bias
  • agent-based models
  • informational efficiency

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