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Marc Goldwein highlights that when U.S. debt exceeds 100 percent of GDP, higher economic growth does not necessarily lead to improved debt sustainability if it also results in rising interest rates.
He suggests the positive effects of growth could be offset by comparable increases in interest costs.
Goldwein has previously observed that each 1% increase in interest rates adds $3.5 trillion to the U.S. national debt, highlighting the scale of fiscal impact (link). He also warned that if interest rates remain elevated, debt could rise by $2 trillion and interest costs may reach 30 percent of federal revenue (link). These estimates outline the potential budgetary pressures as borrowing costs climb.