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Learning in a Generalized Dornbusch Model of Exchange Rate Dynamics

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Abstract

In this paper we propose a framework for studying possible causes of excess exchange rate volatility. The framework consists of a generalized Dornbusch model of exchange rate dynamics, involving imperfect substitutability between assets, lagged nonlinear protfolio adjustment and les than perfectly rational expectations. As the model involves non-linear portfolio adjustment, it remains globally bounded even when the steady state is locally unstable. This economic environment is populated by a group of sophisticated agents who employ a maximum likelihood learning algorithm tolearnce about the "true" model. We use simulations to study the convergence of the learning scheme and its effect on exchange rate dynamics. Our analysis suggests that learning of speed of adjustment type parameters can be a source of exchange rate bubbles because of their effect on the local stability of the steady state.

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  • Carl Chiarella & Alexander Khomin, 2000. "Learning in a Generalized Dornbusch Model of Exchange Rate Dynamics," Working Paper Series 102, Finance Discipline Group, UTS Business School, University of Technology, Sydney.
    • Handle: RePEc:uts:wpaper:102
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    1. Tabellini, Guido, 1988. "Learning and the volatility of exchange rates," Journal of International Money and Finance, Elsevier, vol. 7(2), pages 243-250, June.
    2. Frankel, Jeffrey A & Froot, Kenneth A, 1990. "Chartists, Fundamentalists, and Trading in the Foreign Exchange Market," American Economic Review, American Economic Association, vol. 80(2), pages 181-185, May.
    3. Pagan, Adrian, 1996. "The econometrics of financial markets," Journal of Empirical Finance, Elsevier, vol. 3(1), pages 15-102, May.
    4. Dornbusch, Rudiger, 1976. "Expectations and Exchange Rate Dynamics," Journal of Political Economy, University of Chicago Press, vol. 84(6), pages 1161-1176, December.
    5. Karacaoglu, Girol & Ursprung, Heinrich W., 1988. "Exchange rate dynamics under gradual portfolio adjustment," Journal of Macroeconomics, Elsevier, vol. 10(4), pages 565-589.
    6. Carl Chiarella, 1991. "Monetary and Fiscal Policy Under Nonlinear Exchange Rate Dynamics," Working Paper Series 6, Finance Discipline Group, UTS Business School, University of Technology, Sydney.
    7. Barucci, Emilio & Bischi, Gian Italo & Gardini, Laura, 1999. "Endogenous Fluctuations in a Bounded Rationality Economy: Learning Non-perfect Foresight Equilibria," Journal of Economic Theory, Elsevier, vol. 87(1), pages 243-253, July.
    8. Gray, Malcolm R & Turnovsky, Stephen J, 1979. "The Stability of Exchange Rate Dynamics under Perfect Myopic Foresight," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 20(3), pages 643-660, October.
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