In a recent editorial published in the Wall Street Journal, the Chief Economist for Bear Stearns (an American investment bank) advocated intervention by America's Federal Reserve Bank on behalf of the Dollar.  He reasons that the best way both to fight and inflation and alleviate the possibility of recession is to strengthen the USD.  Current measures, which include lowering the discount rate and manipulating the money supply, are actually worsening inflation.  As a result, institutional investors are moving their capital en masse outside the US in order to prevent the declining dollar from corroding their investment returns. While paying lip service to the prevailing wisdom that Central Banks are essentially impotent when it comes to managing currencies, he insists that strong rhetoric by the Fed could conceivably convince investors that it stood behind the "Strong Dollar Policy" it promotes.  The Wall Street Journal reports:

By saying they want a stronger dollar, the Fed...could make it happen. Government policy makers have almost absolute control over perceptions of the future scarcity of dollars. This controls the demand for dollars almost as much as it does the supply, setting its value as much or more than rates do.

So-called 'Sovereign Wealth Funds' are the talk of the town, stealing headlines as part of a multi-billion dollar buying spree.  Anecdotally, stories of these funds and other institutional foreign investors have made a big splash, epitomized by a few high-profile investments in struggling American investment banks.  It no longer appears these stories were isolated, as suggested by some pretty compelling economic data.  In 2007, total foreign direct investment into the United States totaled $400 Billion, which represents a 90% increase over 2006.  In addition, the first few weeks of 2008 saw a frenzy of activity, which suggest this trend will continue.  Investment in the US is being driven primarily by a weak Dollar and attractive stock market valuations.  If the bad news on the US economy continues to pour in, analysts warn that foreigners could play an even larger role in mitigating against recession. The New York Times reports:

The weak dollar has made American companies and properties cheaper in global terms. Even as Americans confront the prospect of a recession, economic growth remains strong worldwide, endowing oil producers like Saudi Arabia and Russia and export powers like China and Germany with abundant cash.

For at least the duration of the current administration, the official US stance towards its currency has been a "strong dollar" policy.  In hindsight, it appears that this policy was entirely baseless, since its was directly undermined by the simultaneous easy monetary policy, and thus it stands to reason that US policymakers did not actually believe that a strong Dollar policy was necessary to pursue.  In a recent op-ed piece published in the Wall Street Journal, one analyst outlines the case for a strong dollar, and by extension, why the depreciating Dollar is bad for the US economy. 

First, since oil contracts are settled in Dollars, a weak Dollar has directly contributed to high oil prices, which has several negative economic and geopolitical consequences. Second, a cheap Dollar is eroding the purchasing power of US consumers directly by making imports more expensive and indirectly through inflation. Third, the weak Dollar shifts the balance of economic power in favor of US competitors, which don't need to grow as fast to keep pace with the US, in Dollar terms.  Finally, the recent weakness threatens the long term reserve status of the Dollar, which has important implications for economic growth and jobs creation.

On the other hand, argues the analyst, the conventional wisdom that a declining Dollar is necessary to correct the current account and trade deficit is bunk, since much of the trade deficit is accounted for by intra-company trade and since the current account deficit is generally overstated and not connected to currency valuations. In short, he argues, it is in the best interest of the US to align its rhetoric with its economic and monetary policies such that the long term luster of the Dollar is restored.

As far as Dollar bulls are concerned, all news is bad news. An economic recession seems inevitable. Interest rates are already negative in real terms, and are now the lowest in the industrialized world, save Japan.  It's still unclear how much subprime debt will be written down by financial companies before all is said and done.  But analysts from Brown Brothers Harriman, an investment bank, think the Dollar's multi-year decline is coming to an end.  There are two main reasons underlying their rationale.  The first point is purely technical- that the all of the bad news and in fact, the worst possible scenario, has already been priced into the Dollar.  The second point is fundamental- that the speculative hot money that has poured into the US as foreign investors take advantage of a weak Dollar and that is sustaining the US current account deficit is now transitioning into long-term foreign direct investment.  The Financial Post reports:

In addition, BBH believes that in a weak dollar environment, foreign companies will now start looking to move production and sourcing to the United States, following the successful example of Japanese auto makers.