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Belief Formation, Second Version

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  • Olivier Compte

    ()
    (Paris School of Economics)

  • Andrew Postlewaite

    ()
    (Department of Economics, University of Pennsylvania)

Abstract

Consider an agent who is unsure of the state of the world and faces computational bounds on mental processing. The agent receives a sequence of signals imperfectly correlated with the true state that he will use to take a single decision. The agent is assumed to have a finite number of "states of mind" that quantify his beliefs about the relative likelihood of the states, and uses the signals he receives to move from one state to another. At a random stopping time, the agent will be called upon to make a decision based solely on his mental state at that time. We show that under quite general conditions it is optimal that the agent ignore signals that are not very informative, that is, signals for which the likelihood of the states is nearly equal. This model provides a possible explanation of systematic inference mistakes people may make.

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Bibliographic Info

Paper provided by Penn Institute for Economic Research, Department of Economics, University of Pennsylvania in its series PIER Working Paper Archive with number 12-027.

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Length: 27 pages
Date of creation: 01 Mar 2009
Date of revision: 01 Jul 2012
Handle: RePEc:pen:papers:12-027

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Keywords: Decision Theory; Beliefs; Behavioral Economics;

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  1. Hvide, Hans K., 2002. "Pragmatic beliefs and overconfidence," Journal of Economic Behavior & Organization, Elsevier, Elsevier, vol. 48(1), pages 15-28, May.
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