Stock Market Selloff Highlights U.S. Debt Burden Fears

A brutal stock selloff last week has shed light on Wall Street's true fears about the growing U.S. debt burden, according to a top economist.

The 10-year Treasury yield had been rising sharply before easing in recent weeks as investors sought refuge in government bonds. However, its trajectory was marked by a significant spike of over 100 basis points, pushing it above 5% and reaching its highest level in 24 years at one point. This surge began after the outbreak of war with Iran in late February.

The conflict sent oil prices soaring, prompting expectations that the Federal Reserve would raise interest rates to combat resurgent inflation. Meanwhile, hyperscalers have been flooding the bond market with fresh debt to finance massive capital expenditures and the AI infrastructure boom. This has sustained a hot economy and sticky inflation.

This influx of debt from hyperscalers has competed for investors' dollars as the Treasury Department taps the bond market to finance its $2 trillion budget deficit and service the $40 trillion in U.S. debt. Some analysts have downplayed the spike in yields, attributing it to the crowding out effect caused by AI debt on the U.S. bond market.

The recent market downturn has sparked a debate about the true drivers of rising bond yields in the US. According to Robin Brooks, a senior fellow at the Brookings Institution, the past week's selloff provides valuable insights into this issue.

Brooks argues that the current market environment is not comparable to the IT bubble of the early 2000s, when corporate borrowing reached unprecedented levels. In contrast, public borrowing is now historically high and more likely driving up yields.

The latest jobs report, which showed payrolls growing at a rate double what analysts had expected, also failed to support the argument that AI is responsible for higher yields. The bond market's reaction was particularly telling, with the two-year yield rising more than anticipated by hot economic growth.

Brooks points out that the rise in yields following the jobs report cannot be explained solely by the prospect of strong economic growth. This suggests that investors are factoring in risks associated with the trajectory of US debt and deficits.

The market-implied yield for a 10-year security 10 years from now is another indicator of these concerns, gauging the premium investors demand to hold Treasuries over the long term.

The recent surge in long-term yields has been a major concern for investors and economists alike. One key indicator that suggests fiscal risk is at play is the 10-year10-year forward yield, which measures the market-implied yield for a 10-year security 10 years from now.

This metric remained steady despite the decline in both 10-year and two-year yields, indicating that the increase in long-term yields is not solely driven by an AI bubble. In fact, this stability further supports the notion that fiscal risk is the primary driver of the market's concerns. The economist's observation highlights the significance of this indicator.

The recent midterm elections and the subsequent sell-off in AI-related stocks have provided a unique opportunity to analyze the underlying factors contributing to rising long-term yields. By isolating these events, experts can better understand what is driving the market's behavior. According to the data, the increase in long-term yields is linked to growing fiscal stress.

The federal budget deficit has been widening at an alarming rate, with the Treasury Department reporting a $1.99 trillion gap for fiscal year 2026, a 12% increase from the previous year. Revenue growth of 3% was outpaced by a 6% surge in spending, which is primarily driven by increasing interest payments on the national debt.

The US government's growing national debt has led to a significant increase in interest payments, which have surpassed growth in total spending, revenue, and GDP.

Net interest payments rose by 8% to $1.05 trillion, outpacing other areas of growth. This surge in interest costs is substantial, equating to approximately $2.9 billion per day. The Peter G. Peterson Foundation estimates that these net interest costs represent a staggering 3.2% of GDP, surpassing the previous record set in 1991.

The alarming trend has prompted warnings from experts, who caution that the cycle of higher interest rates and debt could ultimately lead to a catastrophic outcome. Committee for a Responsible Federal Budget President Maya MacGuineas emphasized the urgency of addressing this issue, stating that "there are no easy fixes" and that it cannot be wished away.