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The Macroeconomics of Modigliani-Miller

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  • Gersbach, Hans
  • Haller, Hans
  • Müller, Jürg
Abstract
We examine the validity of a macroeconomic version of the Modigliani-Miller theorem. For this purpose, we develop a general equilibrium model with two production sectors, risk-averse households and financial intermediation by banks. Banks are funded by deposits and (outside) equity and monitor borrowers in lending. We impose favorable manifestations of the underlying frictions and distortions. We obtain two classes of equilibria. In the first class, the debt-equity ratio of banks is low. The first-best allocation obtains and banks' capital structure is irrelevant for welfare: a macroeconomic version of the Modigliani-Miller theorem. However, there exists a second class of equilibria with high debt-equity ratios. Banks are larger and invest more in risky technologies. Default and bailouts financed by lump sum taxation occur with positive probability and welfare is lower. Imposing minimum equity capital requirements eliminates all inefficient equilibria and guarantees the global validity of the macroeconomic version of the Modigliani-Miller theorem.

Suggested Citation

  • Gersbach, Hans & Haller, Hans & Müller, Jürg, 2013. "The Macroeconomics of Modigliani-Miller," CEPR Discussion Papers 9402, C.E.P.R. Discussion Papers.
    • Handle: RePEc:cpr:ceprdp:9402
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    Cited by:

    1. Kogler, Michael, 2020. "Risk shifting and the allocation of capital: A Rationale for macroprudential regulation," Journal of Banking & Finance, Elsevier, vol. 118(C).
    2. Papageorgiou, Stylianos, 2022. "Bank levy and household risk-aversion," Journal of Banking & Finance, Elsevier, vol. 138(C).
    3. León-Ledesma, Miguel & Orrillo, Jaime, 2021. "Production, bankruptcy, and financial policies under collateral constraints," Mathematical Social Sciences, Elsevier, vol. 112(C), pages 109-119.
    4. Bossone, Biagio, 2024. "A Modigliani-Miller theorem for the public finances of globalized economies," International Review of Financial Analysis, Elsevier, vol. 94(C).
    5. Gersbach, Hans & Haller, Hans & Papageorgiou, Stylianos, 2018. "Regulatory Competition in Banking: A General Equilibrium Approach," CEPR Discussion Papers 12791, C.E.P.R. Discussion Papers.
    6. Salomon Faure & Hans Gersbach, 2022. "Loanable funds versus money creation in banking: a benchmark result," Journal of Economics, Springer, vol. 135(2), pages 107-149, March.
    7. Hans Gersbach, 2021. "Elections, the curse of competence and credence policies," Public Choice, Springer, vol. 186(3), pages 491-511, March.
    8. Salomon Faure & Hans Gersbach, 2021. "On the money creation approach to banking," Annals of Finance, Springer, vol. 17(3), pages 265-318, September.
    9. Ripamonti, Alexandre, 2020. "Financial institutions, asymmetric information and capital structure adjustments," The Quarterly Review of Economics and Finance, Elsevier, vol. 77(C), pages 75-83.
    10. Gersbach, Hans & Haller, Hans & Papageorgiou, Stylianos, 2020. "Regulatory competition in banking: Curse or blessing?," Journal of Banking & Finance, Elsevier, vol. 121(C).
    11. Volker Britz & Hans Gersbach & Hans Haller, 2021. "Deposit insurance and reinsurance," Annals of Finance, Springer, vol. 17(4), pages 425-470, December.
    12. Miguel Leon-Ledesma & Jaime Orrillo, 2016. "Production and Endogenous Bankruptcy under Collateral Constraints," Studies in Economics 1610, School of Economics, University of Kent.

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    More about this item

    Keywords

    Banking; Capital requirements; Capital structure; Financial intermediation; General equilibrium; Modigliani-miller;
    All these keywords.

    JEL classification:

    • D53 - Microeconomics - - General Equilibrium and Disequilibrium - - - Financial Markets
    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • G2 - Financial Economics - - Financial Institutions and Services

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