Last week's announcement that U.S. government debt has reached $40 trillion triggered alarm in global financial markets, with long-term interest rates hitting their highest level since 2007. The Treasury Department's plan to double purchases of long-term securities was dismissed by investors as a "band-aid on a bullet hole," per the Financial Times, working only briefly before rates resumed climbing. Tech giants are now tapping corporate bond markets to fund AI data centers, adding pressure.

Secretary Scott Bessent claims yields don't reflect fundamentals, but bond vigilantes disagree. The Congressional Budget Office projects annual deficits rising from 5.8% to 6.7% of GDP over the next decade, adding $24 trillion to public debt. Interest payments will double from $1.0 trillion to $2.1 trillion (3.3% to 4.6% of GDP) by 2036, when two-thirds of borrowing will service debt — a "debt spiral." The Trump administration's proposed defense spending increase would add trillions more.

Historical patterns show tax cuts and unexpected spending (wars, recessions) consistently derail projections. The article argues for a surtax to fund defense increases and safety net stabilization, warning that fiscal unsustainability threatens global standing as much as military weakness.