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Effects of Corporate Diversification: Evidence From the Property–Liability Insurance Industry

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  • Andre P. Liebenberg
  • David W. Sommer

Abstract

Using a sample of property–liability insurers over the period 1995–2004, we develop and test a model that explains performance as a function of line‐of‐business diversification and other correlates. Our results indicate that undiversified insurers consistently outperform diversified insurers. In terms of accounting performance, we find a diversification penalty of at least 1 percent of return on assets or 2 percent of return on equity. These findings are robust to corrections for potential endogeneity bias, alternative risk measures, alternative diversification measures, and an alternative estimation technique. Using a market‐based performance measure (Tobin's Q) we find that the market applies a significant discount to diversified insurers. The existence of a diversification penalty (and diversification discount) provides strong support for the strategic focus hypothesis. We also find that insurance groups underperform unaffiliated insurers and that stock insurers outperform mutuals.

Suggested Citation

  • Andre P. Liebenberg & David W. Sommer, 2008. "Effects of Corporate Diversification: Evidence From the Property–Liability Insurance Industry," Journal of Risk & Insurance, The American Risk and Insurance Association, vol. 75(4), pages 893-919, December.
  • Handle: RePEc:bla:jrinsu:v:75:y:2008:i:4:p:893-919
    DOI: 10.1111/j.1539-6975.2008.00290.x
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