A primer on deficit spending and its ability to continue

Paul Craig Roberts- US Treasury debt is denominated in US dollars, so US bills/bonds can always be redeemed by Federal Reserve creation of US dollars.

Deficit spending is when government overspends its revenues and issues Treasury bills/bonds to borrow the money to fill the gap. If the debt instruments cannot be sold at the interest rate the Fed is maintaining, the Fed buys the bonds.

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https://thealtworld.com/paul_craig_roberts/a-primer-on-deficit-spending-and-its-ability-to-continue