Wall Street’s Debt Concern Hits a New High as Bond Yields Surge – Fortune

The massive debt burden now dominates Wall Street’s focus, eclipsing the AI boom as the primary market concern.

For years, and even decades, the rapid rise of U.S. debt triggered warnings that investors largely ignored, as low borrowing costs fueled robust stock market gains.

At the same time, the debt accumulation accelerated, interest expenses claimed a larger slice of the federal budget, and deficits kept widening. Rating agencies downgraded U.S. credit, and foreign central banks reduced their Treasury purchases.

While the exact tipping point remained elusive—particularly given the dollar’s reserve‑currency status—a global bond selloff last week drove yields to two‑decade highs, signaling that debt has moved to the forefront of market worries.

“When does debt become unsustainable? When the global financial markets say it is,” RSM Chief Economist Joseph Brusuelas said in a note. “That appears to be happening.”

Concerns were not confined to the United States; yields have also spiked in major economies such as the U.K., France, Germany, and Japan.

Governments have persisted in spending as if borrowing costs remained at crisis‑low levels and have allowed deficits to expand as though their economies still required emergency stimulus since the COVID‑19 pandemic.

The economic environment, however, has changed dramatically. Interest rates have risen sharply in recent years to curb inflation, while the AI boom channels hundreds of billions of dollars annually into an economy that is increasingly resilient to higher rates.

Moreover, large technology firms, or “hyperscalers,” are increasingly turning to debt to fund capital projects, adding to competition with the Treasury for bond‑market capital.

“Given that public debt is already so high for many countries, it’s only been a matter of time until markets run out of patience,” Robin Brooks, a senior fellow at the Brookings Institution, wrote in a Substack post. “It looks like that’s happening now.”

The rapid rise in yields prompted the Treasury to announce an accelerated buyback of long‑dated bonds, which temporarily lowered yields before markets resumed upward pressure as investors questioned the durability of such financial engineering.

How did we get here?

Beyond deficits, a confluence of factors has now triggered market alarm. The most immediate catalyst has been rising oil prices, driven by the prolonged standoff between the United States and Iran.

With no diplomatic breakthrough in sight, investors anticipate that energy costs will sustain higher inflation, potentially compelling central banks to raise rates further.

Federal Reserve Chair Kevin Warsh has withheld forward guidance on how policymakers will address future inflation, introducing uncertainty that exerts additional upward pressure on bond yields.

Brusuelas highlighted a glaring issue: economic populism across the political spectrum. On the left, it manifests as increased spending; on the right, as tax cuts.

Both approaches also accept higher inflation and resist central banks’ efforts to control it, he noted.

“If such policies go on long enough without a course correction, banking and currency crises tend to follow,” Brusuelas warned. “Global investors understand the end game of such policies.”

Analysts at Capital Economics observed in a recent note that bond investors are now demanding higher compensation for fiscal, geopolitical, and policy uncertainty, a shift they view as lasting.

Although the speed of the bond selloff may not be fully explained by recent events, the market’s concerns are rational given that governments show few signs of reining in deficits, they added.

Consequently, a higher term premium—the additional yield investors require for long‑term holdings—is now “fundamentally warranted.”

“As a result, we expect term premia to remain elevated and bond markets to remain susceptible to renewed bouts of volatility in the quarters ahead,” Capital Economics predicted.

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