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The size premium as a lottery

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  • Richard J. McGee
  • Jose Olmo

Abstract

We investigate empirically the dependence of the size effect on the top performing stocks in a cross-section of risky assets separated by industry. We propose a test for a lottery-style factor payoff based on a stochastic utility model for an under-diversified investor. The associated conditional logit model is used to rank different investment portfolios based on size and we assess the robustness of the ranking to the inclusion/exclusion of the best performing stocks in the cross-section. Our results show that the size premium has a lottery-style payoff and is spurious for most industries once we remove the single best returning stock in an industry from the sample each month. Analysis in an asset pricing framework shows that standard asset pricing models fail to correctly specify the size premium on risky assets when industry winners are excluded from the construction of the size factor. Our findings have implications for stock picking, investment management and risk factor analysis.

Suggested Citation

  • Richard J. McGee & Jose Olmo, 2021. "The size premium as a lottery," The European Journal of Finance, Taylor & Francis Journals, vol. 27(1-2), pages 158-177, January.
    • Handle: RePEc:taf:eurjfi:v:27:y:2021:i:1-2:p:158-177
    DOI: 10.1080/1351847X.2019.1644360
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