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sbfriedman has it right.
it's a rhetorical tactic.
the point is that the federal government doesn't face a financial solvency constraint.
there are political constraints. a budget authorization by Congress is a constraint. the debt-ceiling is a political constraint.
there are REAL constraints (real resources, stuff for the government to buy, population)
but there is nothing to stop the government from purchasing anything that is available for sale in its own currency should it chose and is allowed to do so.
government debt is denominated in U.S. dollars and represents a government savings account.
this is a tool to fix interest rates not provide bond revenue for the government to spend.
the U.S. government is 17 trillion in debt and yet every year it's "allowed" to "roll over" the national debt 4 times, and over the last decade the U.S. Treasury has redeemed over $400 trillion in government securities, and it's issued 17 trillion more than redeemed.
clearly something VERY different is going on for the currency issuer than for the currency user, no?