] The dollar fell on Tuesday, as market worries that
] central banks were diversifying reserves out of U.S.
] assets pushed the currency below key technical support
] levels.

This is the sort of thing that I brought up months ago. A bit fasrther down the article it notes that South Korea holds about $69 Billion in US debt. This brings us right back to the original question, "What happens when the government decides to do some borrowing and no one takes the loan?"