I read the Economist piece that Kitchen Pete quoted with great interest. I believe the essential point there has some validity: namely that the dollar's position as the world's primary reserve currency confers certain benefits on us, and that it may be threatened by our balance of payments deficit. However, as in most such analyses, I find some elements that defy understanding, such as this one.
Quote:Periods of dollar decline have often been unhappy for the world economy. The breakdown of Bretton Woods that led to a weaker dollar in the early 1970s was painful for all, contributing to rising inflation and recession. In the late 1980s, the falling dollar had few ill-effects on America's economy, but it played a big role in inflating a bubble in Japan by forcing Japanese authorities to slash interest rates.
The fact is that Japan reduced interest rates to almost nothing, after the collapse of the real estate bubble, to stave off a collapse of their banking system and stimulate growth in a then stagnant economy. The internal Japanese problem of dead companies being kept alive by recycled loans from near dead banks was a far greater factor in the phenomenon - as described in great detail in other articles in the Economist.
It is all too common in such prognostications for analysts' predictions to run afoul of two key points: (1) Quasi-linear extrapolations in a highly non-linear world can be both appealing and deceptive; (2) There are other factors besides those identified in the process, and they, in a non-linear dynamic can have decisive effects. The coming explosion in the earth's population, so confidently forecast by self-proclaimed sages just two decades ago, has turned out to instead be a precursor to an actual decline, now forecast to begin in a few decades, based on solid demographic data. There are also political and geostrategic factors involved in getting or keeping a country's status as the issuer of a reserve currency, as amply confirmed in the histories of the late years of the Spanish and British empires.
What might replace the dollar as the world's reserve currency? I doubt the Euro will do it. Despite the truly amazing success the EU has achieved so far in perfecting its economic and political union, there may be a more difficult road ahead. Lifting up the economies of the new, central European members may be more difficult and may cause more internal dissention than the previous problem of lifting up the economies of Ireland, Portugal, and Greece. More importantly all of the EU area is faced with an ongoing and accelerating demographic collapse, and this leads to a number of social, economic, and political problems.
GDP growth in the U.S. has been a good deal greater than that in Europe. More to the point, however, is that GDP per capita in the U.S. is also growing slightly relatively to that in Western Europe. The median age of Europeans is almost four years greater than Americans - a huge difference in demographic terms. None of this suggests to me that the currency of the relatively sclerotic economies of Europe will seriously threaten ours.