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Overconfidence and Market Efficiency with Heterogeneous Agents Author info | Abstract | Publisher info | Download info | Related research | Statistics Diego Garcia
Francesco Sangiorgi
Branko Urosevic
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We study financial markets in which both rational and overconfident agents coexist and make endogenous information acquisition decisions. We demonstrate the following irrelevance result: when a positive fraction of rational agents (endogeneously) decides to become informed in equilibrium, prices are set as if all investors were rational, and as a consequence the overconfidence bias does not aect informational efficiency, price volatility, rational traders’ expected profits or their welfare. Intuitively, as overconfidence goes up, so does price infornativeness, which makes rational agents cut their information acquisition activities, effectively undoing the standard effect of more aggressive trading by the overconfident.
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Paper provided by Department of Economics and Business, Universitat Pompeu Fabra in its series Economics Working Papers with number
786.
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Date of creation: Oct 2004Date of revision:
Handle: RePEc:upf:upfgen:786Contact details of provider: Web page: http://www.econ.upf.edu/
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Keywords: Partially revealing equilibria ; overconfidence ; rational expectations ; information ; Other versions of this item:
Find related papers by JEL classification: D80 - Microeconomics - - Information, Knowledge, and Uncertainty - - - General G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data)
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