Are Exchange Rates Excessively Variable?
"Unnecessary variation" is defined as variation not attributable to variation in fundamentals. In the absence of a good model of macroeconomic fundamentals, the question "are exchange rates excessively variable?" cannot be answered by comparing the variance of the actual exchange rate to the variance of a set of fundamentals. This paper notes the failure of regression equations to explain exchange rate movements even using contemporaneous macroeconomic variables. It notes as well the statistical rejections of the unbiasedness of the forward exchange rate as a predictor of the spot rate. It then argues that, given these results, there is not much to be learned from the variance-bounds tests and bubbles tests. The paper also discusses recent results on variation in the exchange risk premiums arising from variation in conditional variances, both as a source of the bias in the forward rate tests and as a source of variation in the spot rate. It finishes with a discussion of whether speculators' expectations are stabilizing or destabilizing, as measured by survey data. The paper concludes that it is possible that exchange rates have been excessively variable -- as, for example, when there are speculative bubbles -- but that if policy-makers try systematically to exploit their credibility in order to stabilize exchange rates, they may see their current credibility vanish.
|Date of creation:||May 1987|
|Date of revision:|
|Publication status:||published as Fischer, Stanley (ed.) NBER Macroeconomics Annual 1987, Vol. 2. The MIT Press, 1987|
|Contact details of provider:|| Postal: |
Web page: http://www.nber.org
More information through EDIRC
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.:
- Salmon, Mark & Wallis, Kenneth F, 1980. "Model Validation and Forecast Comparisons : Theoretical and Practical Considerations," The Warwick Economics Research Paper Series (TWERPS) 184, University of Warwick, Department of Economics.
- Minford, Patrick & Marwaha, Satwant & Matthews, Kent & Sprague, Alison, 1984. "The Liverpool macroeconomic model of the United Kingdom," Economic Modelling, Elsevier, vol. 1(1), pages 24-62, January.
When requesting a correction, please mention this item's handle: RePEc:nbr:nberwo:2249. 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: ()
If references are entirely missing, you can add them using this form.