"The U.S Treasury's forthcoming flood of debt issues threatens to drive up
long-term interest rates. The volume of funds the Treasury needs to borrow
within twelve months has doubled from $1.5 trillion in Oct 2006 to more than
$3.0 trillion in Oct 2008. For the time being, the Treasury can take
advantage of strong safe haven flows to issue short-term securities at
yields below 1 percent. But the appetite for longer-dated paper is
untested."