This is why I watch the value of the U.S. Dollar and try to keep in mind where the trends have been going, should have went or may go if the paradigm changes.....
A quote from Wikipedia:
"Economist Paul Samuelson
and others (including, at his death, Milton Friedman) have maintained that the overseas demand for dollars allows the United States to maintain persistent trade deficits without causing the value of the currency to depreciate or the flow of trade to readjust. But Samuelson stated in 2005 that at some uncertain future period these pressures would precipitate a run against the U.S. dollar with serious global financial consequences."
And the link.