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Why Does the Law of One Price Fail? An Experiment on Index Mutual Funds

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  • James J Choi
  • David Laibson
  • Brigitte C Madrian

Abstract

We evaluate why individuals invest in high-fee index funds. In our experiments, subjects each allocate $10,000 across four S&P 500 index funds and are rewarded for their portfolio’s subsequent return. Subjects overwhelmingly fail to minimize fees. We reject the hypothesis that subjects buy high-fee index funds because of bundled non-portfolio services. Search costs for fees matter, but even when we eliminate these costs, fees are not minimized. Instead, subjects place high weight on annualized returns since inception. Fees paid decrease with financial literacy. Interestingly, subjects who choose high-fee funds sense they are making a mistake.
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Suggested Citation

  • James J Choi & David Laibson & Brigitte C Madrian, 2008. "Why Does the Law of One Price Fail? An Experiment on Index Mutual Funds," Levine's Working Paper Archive 122247000000002014, David K. Levine.
    • Handle: RePEc:cla:levarc:122247000000002014
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    References listed on IDEAS

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    1. John Beshears & James J. Choi & David Laibson & Brigitte C. Madrian, 2011. "How Does Simplified Disclosure Affect Individuals' Mutual Fund Choices?," NBER Chapters, in: Explorations in the Economics of Aging, pages 75-96, National Bureau of Economic Research, Inc.
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    More about this item

    JEL classification:

    • D14 - Microeconomics - - Household Behavior - - - Household Saving; Personal Finance
    • D18 - Microeconomics - - Household Behavior - - - Consumer Protection
    • D43 - Microeconomics - - Market Structure, Pricing, and Design - - - Oligopoly and Other Forms of Market Imperfection
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness

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