Veronique de Rugy warns that U.S. debt at 100% of GDP could trigger market reckoning
Veronique de Rugy published a commentary on Oct. 2, 2026 warning that the United States’ federal debt held by the public has risen to a level equal to the nation’s annual economic output, or 100 percent of GDP.
The observation matters because the debt‑to‑GDP ratio has climbed from roughly 35 percent in 2007 to its current level, while investors have nonetheless kept buying Treasury securities without a clear sign of a market backlash.
De Rugy notes that projections suggesting the debt could reach 175 percent of GDP by 2056 rely on the assumption that no major “black‑swan” events occur over the next two decades. She highlights that this outlook presumes Congress will avoid substantial reforms to Social Security and Medicare and that interest rates will only rise modestly.
She also points out that markets have already reacted to large fiscal imbalances. The 2021‑22 inflation spike—the worst in four decades—was triggered by a $5 trillion wave of deficit spending that investors doubted could be covered by future surpluses, leading to higher price levels.
Current conditions amplify the risk of another reaction. Interest rates are now higher than the low‑rate environment of 2009‑2021, partly due to increased demand for capital from AI‑driven investments and a higher term premium. With inflation still a concern and no fiscal austerity on the horizon, investors are demanding greater compensation for holding long‑term Treasuries.
“The idea that all this debt won’t bring a reckoning may sound tempting, but it’s questionable at best,” de Rugy writes.
Beyond potential market turbulence, the growing debt burden competes with private borrowers for savings, potentially crowding out investment in factories, software, housing, and even the AI sector that some hope will boost growth. The Congressional Budget Office projects that net interest payments could become the largest federal expense by 2040 and consume roughly 40 percent of revenue by 2056.
As Treasury debt matures and is refinanced at higher rates, the fiscal arithmetic will become more strained. While no Treasury sale has yet failed, de Rugy cautions that the next major borrowing round could force the market to reassess the cost of financing Washington’s spending.
Congress faces mounting pressure to address entitlement reform, tax policy, and borrowing limits before a market reaction forces higher rates or inflation, a scenario that could reshape both public finances and the broader economy.
