U.S. bond intervention is like 'paying your mortgage with your credit card,' JPMorgan's Sullivan says

• Global developed-market government debt totals approximately $76 trillion, while corporate bond issuance has surged with AI companies alone issuing $200 billion in 2025, up 80% year-over-year
• Foreign demand for U.S. Treasuries is weakening, with China's holdings at an 18-year low and foreign government custody holdings at their lowest in 14 years
• Bond yields now exceed the S&P 500 earnings yield, making fixed-income assets increasingly competitive with equities and complicating asset allocation decisions for investors

Summary

Key Points:

JPMorgan's James Sullivan, co-head of global fundamental research, criticized U.S. Treasury buyback interventions as a short-term fix that fails to address underlying debt challenges. Treasury Secretary Scott Bessent announced expanded government debt buybacks this week, buying longer-duration bonds while issuing shorter-dated bills—a strategy Sullivan compared to "paying your mortgage with your credit card."

Market Dynamics:

The core issue is unprecedented debt supply overwhelming investor demand. U.S. government debt stands at approximately $40 trillion, while developed-market government debt globally totals around $76 trillion. Traditional buyers are retreating: China's Treasury holdings hit an 18-year low, and foreign government custody holdings reached 14-year lows.

Corporate Debt Surge:

Leading AI companies have issued $200 billion in debt this year, up 80% year-over-year, driven by capital-intensive investments in AI infrastructure, reshoring, and national security projects. This corporate borrowing wave compounds government debt supply pressures.

Investment Implications:

Higher bond yields are making fixed income increasingly competitive with equities. JPMorgan data shows bond yields now exceed the S&P 500's earnings yield, creating complex asset allocation decisions for investors, particularly given elevated stock valuations.

Bottom Line:

Sullivan warned that increasing debt supply will require higher yields to attract buyers, as "the only way you balance supply and demand is through price." Government market interventions may provide temporary relief but don't resolve fundamental supply-demand imbalances. The combination of record debt issuance and declining foreign demand suggests sustained upward pressure on yields, potentially reshaping investor preferences between stocks and bonds.