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Industry Concentration and Average Stock Returns

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  • KEWEI HOU
  • DAVID T. ROBINSON

Abstract

Firms in more concentrated industries earn lower returns, even after controlling for size, book-to-market, momentum, and other return determinants. Explanations based on chance, measurement error, capital structure, and persistent in-sample cash flow shocks do not explain this finding. Drawing on work in industrial organization, we posit that either barriers to entry in highly concentrated industries insulate firms from undiversifiable distress risk, or firms in highly concentrated industries are less risky because they engage in less innovation, and thereby command lower expected returns. Additional time-series tests support these risk-based interpretations. Copyright 2006 by The American Finance Association.

Suggested Citation

  • Kewei Hou & David T. Robinson, 2006. "Industry Concentration and Average Stock Returns," Journal of Finance, American Finance Association, vol. 61(4), pages 1927-1956, August.
  • Handle: RePEc:bla:jfinan:v:61:y:2006:i:4:p:1927-1956
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