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MyPortfolio: The IKEA effect in financial investment decisions

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  • Brunner, Fabian
  • Gamm, Fabian
  • Mill, Wladislaw

Abstract

Creating your own financial portfolio has never been easier than today. While recent literature shows that people overvalue self-built consumer goods (“IKEA effect”) we ask the following question: How do investors value and trade a self-built versus a not self-built financial portfolio? Our pre-registered experimental design allows us to rule out any confounding customization, actual ownership, or learning effects. We find that self-building a portfolio significantly increases corresponding attachment. However, neither valuation of the portfolio nor trading decisions are affected. Thus, our precise estimates suggest that there is no economically relevant “IKEA effect” in financial investment decisions. These results indicate that common portfolio self-building opportunities per se do not directly distort financial markets.

Suggested Citation

  • Brunner, Fabian & Gamm, Fabian & Mill, Wladislaw, 2023. "MyPortfolio: The IKEA effect in financial investment decisions," Journal of Banking & Finance, Elsevier, vol. 154(C).
    • Handle: RePEc:eee:jbfina:v:154:y:2023:i:c:s0378426622001236
    DOI: 10.1016/j.jbankfin.2022.106529
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    More about this item

    Keywords

    IKEA effect; Self-building financial portfolios; Self-directed investing; Investment decisions; Psychological ownership; Belief formation; Experimental finance;
    All these keywords.

    JEL classification:

    • C91 - Mathematical and Quantitative Methods - - Design of Experiments - - - Laboratory, Individual Behavior
    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G41 - Financial Economics - - Behavioral Finance - - - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on Decision Making in Financial Markets
    • G50 - Financial Economics - - Household Finance - - - General

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