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Rational Speculative Bubbles in an Exchange Rate Target Zone

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  • Willem H. Buiter
  • Paolo A. Pesenti

Abstract

The recent theory of exchange rate dynamics within a target zone holds that exchange rates under a currency bard are less responsive to fundamental shocks than exchange rates under a free float, provided that the intervention rules of the Central Bank(s) are common knowledge. These results are derived after having assumed a priori that excess volatility due to rational bubbles does not occur in the foreign exchange market. In this paper we consider instead a setup in which the existence of speculative behavior is a datum the Central Bank has to deal with. We show that the defense of the target zone in the presence of bubbles is viable if the Central Bank accommodates speculative attacks when the latter are consistent with the survival of the target zone itself and expectations are self-fulfilling. These results hold for a large class of exogenous and fundamental-dependent bubble processes. We show that the instantaneous volatility of exchange rates within a bard is not necessarily less than the volatility under free float and analyze the implications for interest rate differential dynamics.

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Bibliographic Info

Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 3467.

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Date of creation: Oct 1990
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Handle: RePEc:nbr:nberwo:3467

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  1. Miller, M. & Weller, P., 1988. "Solving Stochastic Saddlepoint Systems: A Qualitative Treatment With Economic Applications," The Warwick Economics Research Paper Series (TWERPS) 309, University of Warwick, Department of Economics.
  2. Delgado, F. & Dumas, B., 1990. "Monetary Contracting Between Central Banks And The Design Of Sustainable Exchange-Rate Zones," Weiss Center Working Papers 20-90, Wharton School - Weiss Center for International Financial Research.
  3. Lars E.O. Svensson, 1991. "Target Zones and Interest Rate Variability," NBER Working Papers 3218, National Bureau of Economic Research, Inc.
  4. McCallum, Bennett T., 1983. "On non-uniqueness in rational expectations models : An attempt at perspective," Journal of Monetary Economics, Elsevier, vol. 11(2), pages 139-168.
  5. Francisco Delgado & Bernard Dumas, 1990. "Monetary Contracting Between Central Banks and the Design of SustainableExchange-Rate Zones," NBER Working Papers 3440, National Bureau of Economic Research, Inc.
  6. Diba, Behzad T. & Grossman, Herschel I., 1988. "Rational inflationary bubbles," Journal of Monetary Economics, Elsevier, vol. 21(1), pages 35-46, January.
  7. Paul R. Krugman, 1987. "Trigger Strategies and Price Dynamics in Equity and Foreign Exchange Markets," NBER Working Papers 2459, National Bureau of Economic Research, Inc.
  8. Grandmont, Jean-Michel, 1985. "On Endogenous Competitive Business Cycles," Econometrica, Econometric Society, vol. 53(5), pages 995-1045, September.
  9. Thomas J. Sargent & Neil Wallace, 1981. "Some unpleasant monetarist arithmetic," Quarterly Review, Federal Reserve Bank of Minneapolis, issue Fall.
  10. Chiappori, Pierre Andre & Guesnerie, Roger, 1988. "Endogenous fluctuations under rational expectations," European Economic Review, Elsevier, vol. 32(2-3), pages 389-397, March.
  11. Frank Hahn, 1985. "Money and Inflation," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262580624.
  12. Froot, Kenneth A & Obstfeld, Maurice, 1991. "Stochastic Process Switching: Some Simple Solutions," Econometrica, Econometric Society, vol. 59(1), pages 241-50, January.
  13. Sutherland, A. & Miller, M., 1990. "Britain'S Return To Gold And Impending Entry Into The Ems: Expectations, Joining Conditions And Credibility," The Warwick Economics Research Paper Series (TWERPS) 361, University of Warwick, Department of Economics.
  14. Karen K. Lewis, 1990. "Occasional Interventions to Target Rates with a Foreign Exchange Application," NBER Working Papers 3398, National Bureau of Economic Research, Inc.
  15. Flood, Robert P & Garber, Peter M, 1991. "The Linkage between Speculative Attack and Target Zone Models of Exchange Rates," The Quarterly Journal of Economics, MIT Press, vol. 106(4), pages 1367-72, November.
  16. Bertola, Giuseppe & Caballero, Ricardo J, 1992. "Target Zones and Realignments," American Economic Review, American Economic Association, vol. 82(3), pages 520-36, June.
  17. Farmer, Roger E.A. & Woodford, Michael, 1997. "Self-Fulfilling Prophecies And The Business Cycle," Macroeconomic Dynamics, Cambridge University Press, vol. 1(04), pages 740-769, December.
  18. Blanchard, Olivier Jean, 1979. "Speculative bubbles, crashes and rational expectations," Economics Letters, Elsevier, vol. 3(4), pages 387-389.
  19. Francisco Delgado & Bernard Dumas, . "Monetary Contracting between Central Banks and the Design of Sustainable Exchange-Rate Zones (Reprint 035)," Rodney L. White Center for Financial Research Working Papers 20-90, Wharton School Rodney L. White Center for Financial Research.
  20. Delgado, F. & Dumas, B., 1990. "Monetary Contracting Between Central Banks And The Design Of Sustainable Exchange-Rate Zones," The Warwick Economics Research Paper Series (TWERPS) 360, University of Warwick, Department of Economics.
  21. Buiter, W., 1988. "A Viable Gold Standard Requires Flexible Monetary And Fiscal Policy," Papers 306, London School of Economics - Centre for Labour Economics.
  22. Klein, Michael W, 1990. "Playing with the Band: Dynamic Effects of Target Zones in an Open Economy," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 31(4), pages 757-72, November.
  23. Paul Krugman & Julio Rotemberg, 1990. "Target Zones with Limited Reserves," NBER Working Papers 3418, National Bureau of Economic Research, Inc.
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Cited by:
  1. Simon van Norden, 1995. "Regime Switching as a Test for Exchange Rate Bubbles," Econometrics 9502001, EconWPA, revised 09 Aug 1995.
  2. Antoine Magnier, 1992. "Théorie des zones cibles et fonctionnement du SME," Économie et Prévision, Programme National Persée, vol. 104(3), pages 87-113.

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