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Naïve Buying Diversification and Narrow Framing by Individual Investors

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  • JOHN GATHERGOOD
  • DAVID HIRSHLEIFER
  • DAVID LEAKE
  • HIROAKI SAKAGUCHI
  • NEIL STEWART

Abstract

We provide the first tests to distinguish whether individual investors equally balance their overall portfolios (naïve portfolio diversification, NPD) or, in contrast, equally balance the values of same‐day purchases of multiple assets (naïve buying diversification, NBD). We find NBD in purchases of multiple stocks, and in mixed purchases of individual stocks and funds. In contrast, there is little evidence of NPD. Evidence suggests that NBD arises due to stock picking behavior and neglect of diversification. These findings suggest that behavioral finance theory should incorporate transaction, as well as portfolio, framing.

Suggested Citation

  • John Gathergood & David Hirshleifer & David Leake & Hiroaki Sakaguchi & Neil Stewart, 2023. "Naïve Buying Diversification and Narrow Framing by Individual Investors," Journal of Finance, American Finance Association, vol. 78(3), pages 1705-1741, June.
    • Handle: RePEc:bla:jfinan:v:78:y:2023:i:3:p:1705-1741
    DOI: 10.1111/jofi.13222
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    2. Cao, Ji & Rieger, Marc Oliver & Zhao, Lei, 2023. "Safety first, loss probability, and the cross section of expected stock returns," Journal of Economic Behavior & Organization, Elsevier, vol. 211(C), pages 345-369.

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    More about this item

    JEL classification:

    • D14 - Microeconomics - - Household Behavior - - - Household Saving; Personal Finance
    • D53 - Microeconomics - - General Equilibrium and Disequilibrium - - - Financial Markets
    • D91 - Microeconomics - - Micro-Based Behavioral Economics - - - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on Decision Making
    • G02 - Financial Economics - - General - - - Behavioral Finance: Underlying Principles
    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates

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