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A model to analyse financial fragility

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  • Goodhart, Charles
  • Sunirand, Pojanart
  • Tsomocos, Dimitrios P.

Abstract

Our purpose in this paper is to produce a tractable model which illuminates problems relating to individual bank behaviour and risk-taking, to possible contagious interrelationships between banks, and to the appropriate design of prudential requirements and incentives to limit ‘excessive’ risk-taking. Our model is rich enough to include heterogenous agents (commercial banks and investors), endogenous default, and multiple commodity, and credit and deposit markets. Yet, it is simple enough to be effectively computable. Financial fragility emerges naturally as an equilibrium phenomenon. In our model a version of the liquidity trap can occur. Moreover, the Modigliani-Miller proposition fails either through frictions in the (nominal) financial system or through incentives, arising from the imposed capital requirements, for differential investment behaviour because of capital requirements. In addition, a non-trivial quantity theory of money is derived, liquidity and default premia co-determine interest rates, and both regulatory and monetary policies have non-neutral effects. The model also indicates how monetary policy may affect financial fragility, thus highlighting the trade-off between financial stability and economic efficiency.

Suggested Citation

  • Goodhart, Charles & Sunirand, Pojanart & Tsomocos, Dimitrios P., 2004. "A model to analyse financial fragility," LSE Research Online Documents on Economics 24703, London School of Economics and Political Science, LSE Library.
  • Handle: RePEc:ehl:lserod:24703
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    References listed on IDEAS

    as
    1. Geanakoplos, J. D. & Tsomocos, D. P., 2002. "International finance in general equilibrium," Research in Economics, Elsevier, vol. 56(1), pages 85-142, June.
    2. Tsomocos, Dimitrios P., 2003. "Equilibrium analysis, banking and financial instability," Journal of Mathematical Economics, Elsevier, vol. 39(5-6), pages 619-655, July.
    3. Hart, Oliver D., 1975. "On the optimality of equilibrium when the market structure is incomplete," Journal of Economic Theory, Elsevier, vol. 11(3), pages 418-443, December.
    4. Tobin, James, 1982. " The Commercial Banking Firm: A Simple Model," Scandinavian Journal of Economics, Wiley Blackwell, vol. 84(4), pages 495-530.
    5. Tomoyuki Nakajima & Herakles Polemarchakis, 2005. "Money and Prices Under Uncertainty," Review of Economic Studies, Oxford University Press, vol. 72(1), pages 223-246.
    6. Charles Goodhart, 1989. "Money, Information and Uncertainty: 2nd Edition," MIT Press Books, The MIT Press, edition 2, volume 1, number 0262071223, January.
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    More about this item

    JEL classification:

    • F3 - International Economics - - International Finance
    • G3 - Financial Economics - - Corporate Finance and Governance
    • J1 - Labor and Demographic Economics - - Demographic Economics

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