Stinger,
Several quick points:
1) The issue concerns sustained budget deficits.
2) The FY 2007 deficit of $163 billion understates the actual figure. The costs of the military operations in Afghanistan and Iraq are being treated as emergency supplemental spending. Such spending is off budget. Yet, the funds are being borrowed.
3) By the 2nd quarter of 2007, gross public debt amounted to
$8,867.7 billion. That was the equivalent of
64.4% of GDP.
4) Out of the $4,152.6 billion held by private investors, $2,220.0 billion (53.5%) was held by foreigners.
5) In the 2003-present timeframe, foreigners provided funds for 88.7% of the new debt acquired by private investors.
With the value of the U.S. dollar falling, that makes it less worthwhile for foreigners to purchase and hold U.S. debt. At some point, foreigners will expect higher returns to compensate them for the losses inflicted by a weakening dollar. That development would raise borrowing costs for the United States.
So long as the U.S. maintains a substantial trade imbalance, the possibility of pressure on the dollar will remain. Moreover, given that approximately 30% of the U.S. trade deficit is accounted for by oil imports, there are some questions as to how far the U.S. trade imbalance can unwind.
Finally, with the Baby Boom generation beginning to retire, investors may well begin to incorporate structural challenges associated with funding Social Security and Medicare into their expectations. If so, one could see upward pressure on long-term interest rates down the road. If, at some point, the dollar continues to fall and the structural funding challenges are not addressed to the satisfaction of the financial markets, the rise in long-term interest rates could become non-linear as has occurred in some past financial crises in Latin America and Asia. Aside from raising borrowing costs, such increases in interest rates could tend to choke off some economic growth. That, in turn, could make it even more difficult to generate sufficient tax revenue to meet the growing fiscal burden.
All said, the adverse economic consequences associated with chronic fiscal deficits cited in mainstream economic thought may well be delayed, but not denied. At some point, if the U.S. dollar begins to lose its status as the world's preferred reserve currency and/or expectations of returns on U.S. assets/risk perceptions on account of long-term U.S. fiscal challenges worsen, the U.S. likely will not prove immune to past economic experience as it relates to persistent deficits.