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The persistence of abnormal returns at industry and firm levels

The present paper proposes a model for the persistence of abnormal returns both at firm and industry levels, when longitudinal data for the profits of firms classiffied as industries are available. The model produces a two- way variance decomposition of abnormal returns: (a) at firm versus industry levels, and (b) for permanent versus transitory components. This variance decomposition supplies information on the relative importance of the fundamental components of abnormal returns that have been discussed in the literature. The model is applied to a Spanish sample of firms, obtaining results such as: (a) there are significant and permanent differences between profit rates both at industry and firm levels; (b) variation of abnormal returns at firm level is greater than at industry level; and (c) firm and industry levels do not differ significantly regarding rates of convergence of abnormal returns.

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Paper provided by Department of Economics and Business, Universitat Pompeu Fabra in its series Economics Working Papers with number 729.

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Date of creation: Nov 2003
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Handle: RePEc:upf:upfgen:729
Contact details of provider: Web page: http://www.econ.upf.edu/

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  1. Fisher, Franklin M & McGowan, John J, 1983. "On the Misuse of Accounting Rates of Return to Infer Monopoly Profits," American Economic Review, American Economic Association, vol. 73(1), pages 82-97, March.
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  7. Cubbin, John & Geroski, Paul A, 1987. "The Convergence of Profits in the Long Run: Inter-firm and Inter-industry Comparisons," Journal of Industrial Economics, Wiley Blackwell, vol. 35(4), pages 427-42, June.
  8. Anita M. McGahan & Michael E. Porter, 2002. "What Do We Know About Variance in Accounting Profitability?," Management Science, INFORMS, vol. 48(7), pages 834-851, July.
  9. Schmalensee, Richard, 1985. "Do Markets Differ Much?," American Economic Review, American Economic Association, vol. 75(3), pages 341-51, June.
  10. Satorra, Albert, 2002. "Asymptotic Robustness In Multiple Group Linear-Latent Variable Models," Econometric Theory, Cambridge University Press, vol. 18(02), pages 297-312, April.
  11. Mueller, Dennis C, 1977. "The Persistence of Profits above the Norm," Economica, London School of Economics and Political Science, vol. 44(176), pages 369-80, November.
  12. Peltzman, Sam, 1977. "The Gains and Losses from Industrial Concentration," Journal of Law and Economics, University of Chicago Press, vol. 20(2), pages 229-63, October.
  13. Demsetz, Harold, 1973. "Industry Structure, Market Rivalry, and Public Policy," Journal of Law and Economics, University of Chicago Press, vol. 16(1), pages 1-9, April.
  14. Geroski, Paul A & Jacquemin, Alexis, 1988. "The Persistence of Profits: A European Comparison," Economic Journal, Royal Economic Society, vol. 98(391), pages 375-89, June.
  15. Robert Jacobson & Gary Hansen, 2001. "Modeling the competitive process," Managerial and Decision Economics, John Wiley & Sons, Ltd., vol. 22(4-5), pages 251-263.
  16. Demsetz, Harold, 1979. "Accounting for Advertising as a Barrier to Entry," The Journal of Business, University of Chicago Press, vol. 52(3), pages 345-60, July.
  17. Waring, Geoffrey F, 1996. "Industry Differences in the Persistence of Firm-Specific Returns," American Economic Review, American Economic Association, vol. 86(5), pages 1253-65, December.
  18. Benston, George J, 1985. "The Validity of Profits-Structure Studies with Particular Reference to the FTC's Line of Business Data," American Economic Review, American Economic Association, vol. 75(1), pages 37-67, March.
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