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Betas, market weights and the cost of capital: The example of Nokia and small cap stocks on the Helsinki Stock Exchange

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  • Lally, Martin
  • Swidler, Steve

Abstract

This paper examines the relationship between the market weight of a single stock and the betas of both that stock and the residual portfolio. Theory suggests that the effect of such a large weight is to significantly reduce the beta of the residual portfolio, and it may also significantly raise the beta of the single stock. Furthermore, substantial changes in a stock's market weight will also affect the market risk premium. These results have important implications for cost of capital estimates in markets where there are one or a few large firms. To illustrate the effect of market weight on beta and the cost of capital, the analysis considers the recent case of Nokia and the Helsinki Stock Exchange during a period when Nokia's market weight ranged from 9% to 72%.

Suggested Citation

  • Lally, Martin & Swidler, Steve, 2008. "Betas, market weights and the cost of capital: The example of Nokia and small cap stocks on the Helsinki Stock Exchange," International Review of Financial Analysis, Elsevier, vol. 17(5), pages 805-819, December.
    • Handle: RePEc:eee:finana:v:17:y:2008:i:5:p:805-819
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    Cited by:

    1. Hahl, Teemu & Vähämaa, Sami & Äijö, Janne, 2014. "Value versus growth in IPOs: New evidence from Finland," Research in International Business and Finance, Elsevier, vol. 31(C), pages 17-31.
    2. Nader Virk & Hilal Butt, 2016. "Specification errors of asset-pricing models for a market characterized by few large capitalization firms," Journal of Economics and Finance, Springer;Academy of Economics and Finance, vol. 40(1), pages 68-84, January.
    3. Janas Krzysztof, 2018. "Comparison of Risk Index Estimating Methods on the Polish Financial Market," Financial Internet Quarterly (formerly e-Finanse), Sciendo, vol. 14(4), pages 1-11, December.

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