In
form it appears like the United States is incurring a debt obligation like any ordinary currency user but that's not what is happening in
substance. The United States has the Power of the Purse. It has no need whatsoever to borrow money from ordinary currency users when it can issue money whenever it wants.
If you had an unlimited checking account would you use a credit card and pay a bank interest? No, of course not.
But, the U.S. Federal government is not just consuming resources for its own benefit. It has a responsibility to try and make sure its spending does not destroy the value of U.S. dollars. It is the custodian of the money supply.
So, instead of just spending all kinds of new dollars into the private economy when it deficit spends, U.S. Treasuries are issued to lock up dollars out of the transactional money supply when the Federal Government spends more money than it taxes. If it did not issue treasuries when it spent more than it taxed, it would increase the money supply and in normal times affect the Fed's ability to control interest rates, risk inflation, etc.
U.S. Treasuries are necessary as part of controlling the money supply, not because the only provider of dollars in the world needs to "borrow" them.
Don't believe me? Of course you don't.
Here is Former Deputy Secretary of the Treasury Frank N. Newman describing how it is misleading to refer to U.S. Treasury's as "debt"/"borrowing" in his book "Freedom From National Debt" which is available for less than $5.00 on a Kindle
http://www.amazon.com/Freedom-National-Debt-Frank-Newman/dp/1626520380/ref=sr_1_1?ie=UTF8&qid=1393343766&sr=8-1&keywords=freedom+from+national+debt.
"People often have misconceptions about Treasury securities "national debt" because they think of them as similar to personal debt. When people borrow money, they incur real debt, an obligation that must be repaid in full with money earned from another source. Borrowers owe money to their lenders. But "national debt" is not the same as personal debt for countries like America, with their own currencies".
"In many ways, applying the term "debt" to Treasuries leads to a number of assumptions that are relevant for individual debt but are simply not applicable to Treasury Securities."
Calling it "debt" is really a holdover from the Gold Standard. During the Gold Standard, we would have to get our hands on Gold and therefore the terms "borrow" and "debt" were applicable. We went through the looking glass on August 15th, 1971 and that all changed. We just kept the old terminology around.
However, as the "debt" and "deficit" hysteria has swept the nation and driven democrats insane over "budget busting tax cuts gahh" and Republicans mad over "$1trillllllllllion dollar deficits gaghahh" It's probably time to change the terminology so we can focus on designing taxing and spending proposals that will lead to maximum employment and output rather than stagnation and mass unemployment because we're scared of big numbers of outstanding Treasury Securities because we call them "debt".
For instance, the SEC and the CBO and the OMB ought to call it the U.S. Monetary Trust (IMHO) instead of the "National Debt", or something like that because that more accurately describes what is happening. The U.S. Treasury holds X amount of dollars on trust at the FED and compensates for the Time Value of Money with interest payments (which do not consume real resources) in exchange for keeping those dollars out of the M1 money supply.