Mover Mike

It is a portentous issue. Foreign governments and individuals hold about half of the $3.7 trillion in outstanding U.S. Treasury bonds, for example, and the government has been heavily dependent on continued overseas bond purchases to finance the roughly $1 billion a day it has to borrow to pay its bills. Foreign lending and investment are also needed to finance the country's roughly $50 billion monthly trade deficit, while foreign capital has been a key prop to U.S. stock prices.

The fear among economists is that those foreign lenders may grow concerned that their portfolios are too swollen with dollar-denominated assets.