Quote from Sparohok:
What makes you think that? Governments respond to the same incentives that anyone else does. When borrowing is cheap, borrow more.
Martin
It doesn't quite work like that. At least in Treasuries. There's very little deviation in the "size" of each auction. Don't confuse deficit creation with debt service.
Rollovers, that is maturing debt, occur weekly. T-Bill (3m,6m,52 wks) issuance dwarfs note issuance. It matters little what the current Treasury's needs are, what is of paramount expense is the borrowing costs when part of that 7 trillion comes a knocking each Monday. So regardless if the 3mo T-Bill rate is 1.25 or 3.25 there's still going to be an auction for 20 billion or so. The Treasury is balancing it's borrowing more and more with the re-issuance of 30's.
This link will explain a bit of all this.
http://www.treas.gov/offices/domestic-finance/debt-management/qrc/2005/2005-q4-charts.pdf