JPMorgan's James Sullivan believes the U.S. Treasury's recent intervention in the bond market offers only temporary relief and risks merely delaying the nation's mounting debt challenges. A surge in government and corporate bond supply, combined with shrinking overseas demand, could continue to push bond yields higher, creating fresh competition for equities and complicating investor allocation decisions.

At the JPMorgan headquarters in New York on January 20, 2026, Sullivan, co-head of global fundamental research at the firm, argued that Washington's measures to ease pressure on the Treasury market may only postpone the underlying problem. Appearing on a Friday program, he explained that the Treasury's actual strategy involves buying back long-dated bonds while issuing short-term bills. While this approach provides temporary relief, it does little to reduce the fundamental debt burden.

Led by Treasury Secretary Scott Bessent, the department announced an expansion of its bond repurchase program on Wednesday. Sullivan compared the operation to swapping short-term borrowing for long-term debt. "It's a bit like using a credit card to pay off a mortgage. It works in the short run, but the mismatch eventually becomes more pronounced," he added.

While such interventions can manage borrowing costs in the near term, Sullivan worries they fail to address the core challenge: the massive accumulation of government and corporate debt that ultimately needs to find buyers. "Most of the time, when the government tries to intervene in markets, it doesn't bode well," he said.

This predicament is not unique to the United States. Sullivan noted that U.S. government debt stands at roughly $40 trillion, while debt across developed economies worldwide totals about $76 trillion, with corporate bond issuance also hitting record highs.

Even with a healthy economic backdrop, the dramatic increase in bond supply will still impact markets, Sullivan said. The flood of new debt requires investors to absorb it, and issuers may have to offer higher yields to attract buyers. "The balance between supply and demand can only be restored through pricing," he said. The situation is further complicated by the fact that some traditional buyers of U.S. Treasuries are reducing their holdings.

China's holdings of U.S. debt have fallen to an 18-year low, while foreign governments' holdings of Treasuries held at the U.S. Treasury have hit a 14-year low.

The borrowing wave extends beyond governments. Driven by artificial intelligence infrastructure, industrial reshoring, and national security-related investments, the economy has become more capital-intensive, and corporations are also tapping the debt markets heavily. Sullivan noted that top AI companies have issued $200 billion in debt so far this year, an 80% increase year-over-year, as spending on data centers and other AI infrastructure intensifies competition for capital.

These shifts are also rippling into the equity markets. With stock valuations elevated, rising bond yields are making fixed-income products increasingly competitive against equities. According to JPMorgan data, bond yields now exceed the earnings yield of the S&P 500, making it more challenging for investors to choose between asset classes. "As the market environment continues to evolve, investors will face far more complex allocation decisions in the future," Sullivan said.