Dornbusch opens by recording the recent huge fluctuations in real exchange rates, and notes that this phenomenon raises several major questions for analysis and research. These questions cover, first, the issue of why exchange rates move by so much for so long, second, whether such prolonged movements have subsequent sustained effects on the economy, and third, whether such phenomena indicate that governments should intervene more forcefully, and cooperatively, to seek to achieve greater exchange rate stability. I shall take his discussion of these issues largely in reverse order, starting with the policy issue. Given his American background, Dornbusch naturally concentrates on the recent history of the US dollar. He notes that 'Fiscal policy, including the expectations of correction associated with Gramm-Rudman, provides one interpretation of the dollar movements in the i 980s', and implies that he prefers this interpretation to the alternative suggestion of 'partial irrationality'. Indeed, in his model, as set out at the start of his paper, there is little room for doubt about the impact of fiscal expansion: thus he states, 'A fiscal expansion in this model brings about currency appreciation.' Yet, while I am prepared to accept that fiscal expansion in the specific context of the United States in the early I 98os did play a sizeable role in that particular exchange rate story, I am less convinced that that episode should be generalised. Here I am not thinking so much of the earlier Keynesian story about an adverse current account effect dominating a capital inflow, as of the credibility of the commitment of a government to meeting its increased debt by a future, deflationary increase in taxes. If a future British Government was to announce that it was going, say, to treble the size of the PSBR, would you expect the sterling exchange rate to go up, or down? If that same government was to announce at the same time that it would continue to adhere to maintaining strict control over domestic monetary growth, would you fully believe it? It may well be that the United States experience depended in some large part on the independence and credibility of Paul Volcker, indeed on a belief that in the end the confrontation of expansionary fiscal policy and counter-inflationary
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