Long-term U.S. borrowing costs are proving unusually resistant to weaker economic signals, raising concerns that investors are demanding greater compensation to hold government debt as Washington’s fiscal position deteriorates.
Robin Brooks, a senior fellow at the Brookings Institution, has argued that the behaviour of U.S. Treasury yields points to softer underlying demand for government bonds than headline market conditions might suggest. The warning comes with U.S. debt at $40 trillion and the federal budget deficit heading towards $2 trillion annually.
Economic Weakness Is No Longer Pulling Yields Lower
Brooks highlighted an unusual disconnect between economic data and the Treasury market. Over the past month, a series of economic releases had fallen below expectations, even though Friday’s employment report came in stronger than forecast.
Normally, evidence of slowing activity would be expected to reduce longer-term yields as investors anticipate weaker growth and less inflation pressure. Instead, yields have continued to climb.
Brooks described conditions surrounding long-term borrowing costs as an “all-hands-on-deck situation.”
There are other pressures at work. The U.S. war on Iran has intensified in recent weeks, while a lack of diplomatic progress has coincided with higher oil prices. More expensive energy can strengthen inflation expectations and give investors another reason to demand higher yields on longer-dated bonds.
Even so, Brooks sees the Treasury market’s response to softer economic numbers as an important signal about demand for U.S. government debt.
Policymakers are also paying close attention. Treasury Secretary Scott Bessent has pursued plans to double Treasury debt buybacks, while Federal Reserve Chair Kevin Warsh used his Jackson Hole address to reinforce his inflation-fighting credentials.
The concern is that fiscal conditions themselves are increasingly influencing the price Washington must pay to borrow.
The Treasury Buyer Base Is Changing
The pressure comes as the composition of the Treasury market shifts. Foreign central banks and other institutions that historically accumulated U.S. government securities as safe assets now play a smaller role, while alternatives such as gold have attracted greater interest.
Norges Bank Investment Management, which oversees the world’s largest sovereign wealth fund with $2.3 trillion in assets, has proposed shifting part of its debt exposure away from Treasuries.
Hedge funds, meanwhile, have become increasingly important participants in the market. Their greater sensitivity to price can make Treasury demand more responsive to changes in yields and potentially contribute to volatility.
RSM chief economist Joseph Brusuelas framed the broader issue around the willingness of markets to keep financing government borrowing. “When does debt become unsustainable? When the global financial markets say it is,” he wrote in a note last month. “That appears to be happening.”
The challenge extends beyond the United States. Government bond yields have also risen in major economies including the U.K., France, Germany and Japan, after years in which public spending expanded while borrowing costs moved sharply above the exceptionally low levels seen around the pandemic.
For businesses and investors, persistently higher Treasury yields matter beyond the government bond market. U.S. Treasury rates serve as important reference points across financial markets, meaning sustained increases can feed into the cost of corporate financing and other forms of credit. If investors increasingly attach a higher premium to long-term U.S. debt, tighter financial conditions could persist even when economic growth begins to soften.
Wall Street Is Divided Over the Debt Signal
Not everyone sees the rise in yields as evidence that a debt crisis is approaching.
Wall Street strategist Ed Yardeni has argued that borrowing costs may simply be returning towards levels that were more common before the Global Financial Crisis and pandemic pushed interest rates to exceptional lows.
Yardeni still considers the long-term trajectory of U.S. debt unsustainable, but does not believe bond investors are signalling an immediate fiscal crisis. He expects the 10-year Treasury yield to remain between 4.00% and 5.00%, a range he considers compatible with a healthy economy.
That disagreement leaves investors watching the relationship between economic data and bond prices closely. If weaker growth continues without producing a meaningful decline in long-term yields, the case that fiscal concerns are playing a larger role will become harder to dismiss.
The next signals will come from inflation, economic activity, Treasury issuance and investor demand. Together, they will show whether higher yields represent a return to historically more normal borrowing costs, or a more fundamental repricing of the risks attached to financing America’s growing debt burden.
