The dollar also fell to a 19-month low against the German mark.
If they do not buy enough, then the dollar must fall.
The first has been fears that the dollar will fall further.
"The market has the view that the central banks will stand aside and let the dollar fall to lower levels."
Instead, investors should focus on why the dollar could fall in 2006.
By the end of the day, the dollar had fallen more than 1 percent against the mark.
In the last three weeks, the dollar has fallen 5 percent against the mark.
He again refused to say the dollar had now fallen far enough.
The longer this takes, of course, the more the dollar will fall.
Since June 1985, the dollar has fallen about 50 percent against the mark.