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Illusion of expertise in portfolio decisions: an experimental approach

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  • Fellner, Gerlinde
  • Guth, Werner
  • Maciejovsky, Boris

Abstract

Overall, 72 subjects invest their endowment in four risky assets. Each com-bination of assets yields the same expected return and variance of returns. Illusion of expertise prevails when one prefers nevertheless the self-selected portfolio. After being randomly assigned to groups of four subjects are asked to elect their "expert" based on responses to a prior decision task. Using the random price mecha-nism reveals that 64% of the subjects prefer their own portfolio over the average group portfolio or the expert’s port-folio. Illusion of expertise is shown to be stable individually, over alternatives, and for both eliciting methods, willingness to pay and to accept.

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Bibliographic Info

Article provided by Elsevier in its journal Journal of Economic Behavior & Organization.

Volume (Year): 55 (2004)
Issue (Month): 3 (November)
Pages: 355-376

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Handle: RePEc:eee:jeborg:v:55:y:2004:i:3:p:355-376

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Cited by:
  1. Dennis Dittrich & Werner Güth & Boris Maciejovsky, . "Overconfidence in Investment Decisions: An Experimental Approach," Papers on Strategic Interaction 2001-03, Max Planck Institute of Economics, Strategic Interaction Group.
  2. Marion Eberlein & Judith Przemeck, 2008. "Whom will you choose? - Collaborator Selection and Selector’s Self-Prediction," Bonn Econ Discussion Papers bgse12_2008, University of Bonn, Germany.
  3. Adam S. Goodie & Diana L. Young, 2007. "The skill element in decision making under uncertainty: Control or competence?," Judgment and Decision Making, Society for Judgment and Decision Making, vol. 2, pages 189-203, June.
  4. Frank Caliendo & Kevin X.D. Huang, 2007. "Overconfidence and Consumption over the Life Cycle," Vanderbilt University Department of Economics Working Papers 0712, Vanderbilt University Department of Economics.

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