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Portfolio Diversification, Market Power, and the Theory of the Firm

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  • Azar, José

    (IESE Business School)

Abstract

This paper develops a model of firm behavior in the context of oligopoly and portfolio diversification by shareholders. Competition for shareholder votes among potential managers seeking corporate office leads to internalization and aggregation of shareholder objectives, including shareholdings in other firms, and the fact that shareholders are consumers and workers of the firms. When all shareholders hold market portfolios, firms that are formally separate behave as a single firm. I introduce new indices that capture the internalization effects from consumer/worker control, and discuss implications for antitrust, stakeholder theory, and the boundaries of the firm.

Suggested Citation

  • Azar, José, 2017. "Portfolio Diversification, Market Power, and the Theory of the Firm," IESE Research Papers D/1170, IESE Business School.
    • Handle: RePEc:ebg:iesewp:d-1170
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    File URL: http://www.iese.edu/research/pdfs/WP-1170-E.pdf
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    References listed on IDEAS

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    1. Jaskold Gabszewicz, Jean & Vial, Jean-Philippe, 1972. "Oligopoly "A la cournot" in a general equilibrium analysis," Journal of Economic Theory, Elsevier, vol. 4(3), pages 381-400, June.
    2. Hart, Oliver & Moore, John, 1990. "Property Rights and the Nature of the Firm," Journal of Political Economy, University of Chicago Press, vol. 98(6), pages 1119-1158, December.
    3. Assar Lindbeck & Jörgen Weibull, 1987. "Balanced-budget redistribution as the outcome of political competition," Public Choice, Springer, vol. 52(3), pages 273-297, January.
    4. Michael C. Jensen, 2010. "Value Maximization, Stakeholder Theory, and the Corporate Objective Function," Journal of Applied Corporate Finance, Morgan Stanley, vol. 22(1), pages 32-42, January.
    5. Roberts, John & Sonnenschein, Hugo, 1977. "On the Foundations of the Theory of Monopolistic Competition," Econometrica, Econometric Society, vol. 45(1), pages 101-113, January.
    6. Paul A. Gompers & Andrew Metrick, 2001. "Institutional Investors and Equity Prices," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 116(1), pages 229-259.
    7. Nielsen, Niels Christian, 1979. " Monopoly Pricing and Diversified Consumers," Scandinavian Journal of Economics, Wiley Blackwell, vol. 81(3), pages 367-377.
    8. Roy Radner, 1974. "A Note on Unanimity of Stockholders' Preferences among Alternative Production Plans: A Reformulation of the Ekern-Wilson Model," Bell Journal of Economics, The RAND Corporation, vol. 5(1), pages 181-184, Spring.
    9. J. Peter Neary, 2002. "The road less travelled : oligopoly and competition policy in general equilibrium," Working Papers 200222, School of Economics, University College Dublin.
    10. Erich Battistin & Richard Blundell & Arthur Lewbel, 2009. "Why Is Consumption More Log Normal than Income? Gibrat's Law Revisited," Journal of Political Economy, University of Chicago Press, vol. 117(6), pages 1140-1154, December.
    11. Chari, V V & Jones, Larry E & Marimon, Ramon, 1997. "The Economics of Split-Ticket Voting in Representative Democracies," American Economic Review, American Economic Association, vol. 87(5), pages 957-976, December.
    12. Farrell, Joseph, 1985. "Owner-consumers and efficiency," Economics Letters, Elsevier, vol. 19(4), pages 303-306.
    13. William F. Sharpe, 1964. "Capital Asset Prices: A Theory Of Market Equilibrium Under Conditions Of Risk," Journal of Finance, American Finance Association, vol. 19(3), pages 425-442, September.
    14. Grossman, Sanford J & Hart, Oliver D, 1986. "The Costs and Benefits of Ownership: A Theory of Vertical and Lateral Integration," Journal of Political Economy, University of Chicago Press, vol. 94(4), pages 691-719, August.
    15. Philip Vermeulen, 2018. "How Fat is the Top Tail of the Wealth Distribution?," Review of Income and Wealth, International Association for Research in Income and Wealth, vol. 64(2), pages 357-387, June.
    16. Hart, Oliver D, 1979. "On Shareholder Unanimity in Large Stock Market Economies," Econometrica, Econometric Society, vol. 47(5), pages 1057-1083, September.
    17. Gordon Roger H., 2003. "Do Publicly Traded Corporations Act in the Public Interest?," The B.E. Journal of Economic Analysis & Policy, De Gruyter, vol. 3(1), pages 1-20, June.
    18. Simon Benninga & Eitan Muller, 1979. "Majority Choice and the Objective Function of the Firm under Uncertainty," Bell Journal of Economics, The RAND Corporation, vol. 10(2), pages 670-682, Autumn.
    19. K. J. Arrow, 1964. "The Role of Securities in the Optimal Allocation of Risk-bearing," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 31(2), pages 91-96.
    20. Michael J. P. Magill & Martine Quinzii & Jean-Charles Rochet, 2013. "A Critique of Shareholder Value Maximization," Swiss Finance Institute Research Paper Series 13-16, Swiss Finance Institute.
    21. Steinar Ekern & Robert Wilson, 1974. "On the Theory of the Firm in an Economy with Incomplete Markets," Bell Journal of Economics, The RAND Corporation, vol. 5(1), pages 171-180, Spring.
    22. Hayne E. Leland, 1974. "Production Theory and the Stock Market," Bell Journal of Economics, The RAND Corporation, vol. 5(1), pages 125-144, Spring.
    23. J. B. Taylor & M. Woodford (ed.), 1999. "Handbook of Macroeconomics," Handbook of Macroeconomics, Elsevier, edition 1, volume 1, number 1.
    24. Rotemberg, Julio J. & Woodford, Michael, 1999. "The cyclical behavior of prices and costs," Handbook of Macroeconomics, in: J. B. Taylor & M. Woodford (ed.), Handbook of Macroeconomics, edition 1, volume 1, chapter 16, pages 1051-1135, Elsevier.
    25. Stuart L. Gillan & Laura T. Starks, 2007. "The Evolution of Shareholder Activism in the United States," Journal of Applied Corporate Finance, Morgan Stanley, vol. 19(1), pages 55-73, January.
    26. David S. Ahn & Santiago Oliveros, 2012. "Combinatorial Voting," Econometrica, Econometric Society, vol. 80(1), pages 89-141, January.
    27. Peter M. DeMarzo, 1993. "Majority Voting and Corporate Control: The Rule of the Dominant Shareholder," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 60(3), pages 713-734.
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    Cited by:

    1. Brito, Duarte & Ribeiro, Ricardo & Vasconcelos, Helder, 2019. "Can partial horizontal ownership lessen competition more than a monopoly?," Economics Letters, Elsevier, vol. 176(C), pages 90-95.
    2. José Azar & Xavier Vives, 2021. "General Equilibrium Oligopoly and Ownership Structure," Econometrica, Econometric Society, vol. 89(3), pages 999-1048, May.
    3. Brito, Duarte & Osório, António & Ribeiro, Ricardo & Vasconcelos, Helder, 2018. "Unilateral effects screens for partial horizontal acquisitions: The generalized HHI and GUPPI," International Journal of Industrial Organization, Elsevier, vol. 59(C), pages 127-189.
    4. Hutschenreiter, Dennis, 2023. "Common Ownership and the Market for Technology," VfS Annual Conference 2023 (Regensburg): Growth and the "sociale Frage" 277640, Verein für Socialpolitik / German Economic Association.
    5. Newham, M. & Seldeslachts, J. & Banal-Estanol, A., 2018. "Common Ownership and Market Entry: Evidence from the Pharmaceutical Industry," Working Papers 18/03, Department of Economics, City University London.
    6. Andrea Pawliczek & A. Nicole Skinner & Sarah L. C. Zechman, 2022. "Facilitating Tacit Collusion Through Voluntary Disclosure: Evidence from Common Ownership," Journal of Accounting Research, Wiley Blackwell, vol. 60(5), pages 1651-1693, December.
    7. Park, Jihwon & Sani, Jalal & Shroff, Nemit & White, Hal, 2019. "Disclosure incentives when competing firms have common ownership," Journal of Accounting and Economics, Elsevier, vol. 67(2), pages 387-415.
    8. Vives, Xavier, 2020. "Common ownership, market power, and innovation," International Journal of Industrial Organization, Elsevier, vol. 70(C).
    9. Ruichang Lu & Qiaowei Shen & Tenghui Wang & Xiaojun Zhang, 2022. "Frenemies: Corporate Advertising Under Common Ownership," Management Science, INFORMS, vol. 68(6), pages 4645-4669, June.
    10. Arjun Jayadev & J.W. Mason & Enno Schröder, 2018. "The Political Economy of Financialization in the United States, Europe and India," Development and Change, International Institute of Social Studies, vol. 49(2), pages 353-374, March.
    11. Brito, Duarte & Ribeiro, Ricardo & Vasconcelos, Helder, 2018. "Quantifying the coordinated effects of partial horizontal acquisitions," European Economic Review, Elsevier, vol. 110(C), pages 108-149.
    12. Brito, Duarte & Elhauge, Einer & Ribeiro, Ricardo & Vasconcelos, Helder, 2023. "Modelling the objective function of managers in the presence of overlapping shareholding," International Journal of Industrial Organization, Elsevier, vol. 87(C).
    13. Li, Zhan, 2017. "Shareholder Activism Externalities," MPRA Paper 91635, University Library of Munich, Germany, revised 21 Jan 2019.
    14. Azar, José & Schmalz, Martin & Tecu, Isabel, 2017. "Anti-Competitive Effects of Common Ownership," IESE Research Papers D/1169, IESE Business School.
    15. Gilje, Erik P. & Gormley, Todd A. & Levit, Doron, 2020. "Who's paying attention? Measuring common ownership and its impact on managerial incentives," Journal of Financial Economics, Elsevier, vol. 137(1), pages 152-178.
    16. Olga Chiappinelli & Konstantinos G. Papadopoulos & Dimitrios Xefteris, 2023. "Common Ownership Unpacked," UB School of Economics Working Papers 2023/448, University of Barcelona School of Economics.
    17. Oz Shy & Rune Stenbacka, 2020. "Common ownership, institutional investors, and welfare," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 29(3), pages 706-723, July.

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    More about this item

    Keywords

    Common Ownership; Theory of the Firm; MHHI; Oligopoly; Stakeholder Theory; Firm Boundaries;
    All these keywords.

    JEL classification:

    • G34 - Financial Economics - - Corporate Finance and Governance - - - Mergers; Acquisitions; Restructuring; Corporate Governance
    • L10 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - General
    • L41 - Industrial Organization - - Antitrust Issues and Policies - - - Monopolization; Horizontal Anticompetitive Practices

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