From Dornbusch to Murphy: Stylized Monetary Dynamics of a contemporary Macroeconometric Model
Dornbusch's 1976 overshooting exchange rate model (hereafter, DBM) has long been known to underpin several large macro models, including the Murphy Model (MM). But the dynamic adjustment paths of variables in MM differ markedly from those in DBM, even qualitatively. A leading case in point is the exchange rate which in MM undershoots its new long run-equilibrium value after the injection of a monetary shock, and then actually moves away from this equi-librium for a time before approaching it via a damped cyclical adjustment path (whereas the corresponding path in DBM is monotonic). This paper gives a simplified account of how this comes about. The emphasis is not so much on theoretical rigour but on providing a convincing practical demonstration. Using the simplest form of DBM as a starting point, it is shown how one can develop a miniature model exhibiting an MM-like response to a monetary shock. The key idea is that aggregate demand does not respond instantaneously (as in DBM) to shocks in the macroeconomic environment, but shows some degree of inertia. Nothing more is required to reconcile the qualitative dynamics of MM with DBM.
|Date of creation:||Jan 1998|
|Date of revision:|
|Contact details of provider:|| Postal: |
Phone: 03 9919 1877
Web page: http://www.copsmodels.com/about.htm
More information through EDIRC
References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Taylor, John B., 1993. "Discretion versus policy rules in practice," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 39(1), pages 195-214, December.
- John B. Taylor, 1995.
"The monetary transmission mechanism: an empirical framework,"
Working Papers in Applied Economic Theory
95-07, Federal Reserve Bank of San Francisco.
- John B. Taylor, 1995. "The Monetary Transmission Mechanism: An Empirical Framework," Journal of Economic Perspectives, American Economic Association, vol. 9(4), pages 11-26, Fall.
- David W.R. Gruen & Marianne C. Gizycki, 1993.
"Explaining Forward Discount Bias: Is it Anchoring?,"
RBA Research Discussion Papers
rdp9307, Reserve Bank of Australia.
- Gruen, D.W.R. & Gizycki, M.C., 1993. "Explaining Forward Discount Bias: Is It Anchoring?," Papers 164, Princeton, Woodrow Wilson School - Public and International Affairs.
- Murphy, C W, 1988. "An Overview of the Murphy Model," Australian Economic Papers, Wiley Blackwell, vol. 27(0), pages 175-99, Supplemen.
- Murphy, C W, 1988. "Rational Expectations in Financial Markets and the Murphy Model," Australian Economic Papers, Wiley Blackwell, vol. 27(0), pages 61-88, Supplemen.
- Dornbusch, Rudiger, 1976. "Expectations and Exchange Rate Dynamics," Journal of Political Economy, University of Chicago Press, vol. 84(6), pages 1161-76, December.
When requesting a correction, please mention this item's handle: RePEc:cop:wpaper:ip-69. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Mark Horridge)
If references are entirely missing, you can add them using this form.