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Trading and Under-Diversification

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  • Anders Anderson

Abstract

This article documents a link between trading and diversification by using detailed trading records from a Swedish discount broker matched with individual tax records. Diversification is measured by the investors' stake size, defined as the fraction of their risky financial wealth invested in individual stocks through the broker under study. High-stake investors have concentrated portfolios, trade more, and achieve lower trading performance. They share several features with those who trade excessively, namely lower income, wealth, age, and education, suggesting that they lack investment expertise. The results directly imply that trading losses in the cross-section are mainly borne by those who can least afford them. Copyright 2013, Oxford University Press.

Suggested Citation

  • Anders Anderson, 2013. "Trading and Under-Diversification," Review of Finance, European Finance Association, vol. 17(5), pages 1699-1741.
    • Handle: RePEc:oup:revfin:v:17:y:2013:i:5:p:1699-1741
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    File URL: http://hdl.handle.net/10.1093/rof/rfs044
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    Cited by:

    1. John R. J. Thompson & Longlong Feng & R. Mark Reesor & Chuck Grace, 2021. "Know Your Clients’ Behaviours: A Cluster Analysis of Financial Transactions," JRFM, MDPI, vol. 14(2), pages 1-29, January.
    2. Paulo Pereira Silva & Victor Mendes, 2023. "Education and financial mistakes: The case of avoidable trading fees in stock markets," Portuguese Economic Journal, Springer;Instituto Superior de Economia e Gestao, vol. 22(2), pages 173-202, May.
    3. Anna Blajer-Gołębiewska, 2021. "Individual corporate reputation and perception of collective corporate reputation regarding stock market investments," PLOS ONE, Public Library of Science, vol. 16(9), pages 1-21, September.
    4. Barth, Daniel, 2014. "The costs and beliefs impliedby direct stock ownership," Working Paper Series 1657, European Central Bank.
    5. Filiz, Ibrahim & Judek, Jan René & Lorenz, Marco & Spiwoks, Markus, 2021. "Reducing algorithm aversion through experience," Journal of Behavioral and Experimental Finance, Elsevier, vol. 31(C).
    6. Daniel Barth, 2018. "The Costs and Beliefs Implied by Direct Stock Ownership," Management Science, INFORMS, vol. 64(11), pages 5263-5288, November.
    7. Filiz, Ibrahim & Nahmer, Thomas & Spiwoks, Markus & Gubaydullina, Zulia, 2020. "Measurement of risk preference," Journal of Behavioral and Experimental Finance, Elsevier, vol. 27(C).
    8. Ma, Guangyuan & Wang, Yihong & Xu, Yekun & Zhang, Limin, 2023. "The breadth of ownership and corporate earnings management," Finance Research Letters, Elsevier, vol. 52(C).
    9. Guglielmo Maria Caporale & Menelaos Karanasos & Stavroula Yfanti & Aris Kartsaklas, 2021. "Investors' trading behaviour and stock market volatility during crisis periods: A dual long‐memory model for the Korean Stock Exchange," International Journal of Finance & Economics, John Wiley & Sons, Ltd., vol. 26(3), pages 4441-4461, July.
    10. Phan, Thuy Chung & Rieger, Marc Oliver & Wang, Mei, 2018. "What leads to overtrading and under-diversification? Survey evidence from retail investors in an emerging market," Journal of Behavioral and Experimental Finance, Elsevier, vol. 19(C), pages 39-55.
    11. Alderighi, Stefano, 2018. "The determinants of retail trading activity in emerging markets: A cross-market analysis," Global Finance Journal, Elsevier, vol. 37(C), pages 152-167.
    12. Ibrahim Filiz & Thomas Nahmer & Markus Spiwoks & Kilian Bizer, 2018. "Portfolio diversification: the influence of herding, status-quo bias, and the gambler’s fallacy," Financial Markets and Portfolio Management, Springer;Swiss Society for Financial Market Research, vol. 32(2), pages 167-205, May.
    13. Talpsepp, Tõnn & Liivamägi, Kristjan & Vaarmets, Tarvo, 2020. "Academic abilities, education and performance in the stock market," Journal of Banking & Finance, Elsevier, vol. 117(C).
    14. Ruiqi Rich Zhu & Cheng He & Yu Jeffrey Hu, 2023. "The Effect of Product Recommendations on Online Investor Behaviors," Papers 2303.14263, arXiv.org, revised Nov 2023.
    15. Hoffmann, Arvid O.I. & Shefrin, Hersh, 2014. "Technical analysis and individual investors," Journal of Economic Behavior & Organization, Elsevier, vol. 107(PB), pages 487-511.
    16. Merkle, Christoph, 2017. "Financial overconfidence over time: Foresight, hindsight, and insight of investors," Journal of Banking & Finance, Elsevier, vol. 84(C), pages 68-87.

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