The U.S. Treasury market, long regarded as the foundation of the global financial system, is showing signs of increased strain amid shifting demand patterns, significant government deficits, and uncertainties in policymaking. The Treasury market, valued at around $30 trillion, has witnessed a gradual rise in long-term yields, with the 10-year note hovering above 4 percent in recent years and a 30-year bond recently issued at a yield of 5 percent—its highest level since 2007.

Historically, strong foreign demand, particularly from central banks in export-driven Asian economies, helped sustain low borrowing costs in the United States. This phenomenon, described by former Federal Reserve Chair Ben Bernanke as a "global savings glut," allowed the U.S. government to finance deficits cheaply. However, recent years have seen a shift as foreign central bank purchases have not kept pace with growing U.S. debt. Economic factors such as China's intervention to support the renminbi and geopolitical considerations, including fears of sanctions, have led countries like Russia and China to diversify away from Treasuries toward other assets such as gold.

The reduction in foreign central bank demand, combined with an expanding supply of Treasury securities, has contributed to rising yields. European Central Bank board member Isabel Schnabel has characterized this evolving environment as a transition from a "global savings glut" to a "global bond glut."

In addition to changing foreign demand, the composition of Treasury buyers has shifted. Short-term investors, particularly hedge funds, have more than doubled their presence over the past five years by acquiring a significant share of the market. Unlike traditional holders such as central banks and pension funds that maintain Treasuries for safety and long-term stability, hedge funds tend to be more sensitive to interest rate movements and can rapidly sell bonds during periods of stress. Their use of leverage to exploit minor price differences has introduced additional volatility into the market.

Efforts to strengthen the infrastructure of the Treasury market could help mitigate some of these pressures. The Securities and Exchange Commission has introduced rules requiring mandatory central clearing for Treasury transactions to reduce counterparty risks and improve liquidity, which may help lower borrowing costs. Some banking industry participants advocate revising capital requirements imposed after the 2008 financial crisis to enable banks to hold more U.S. government debt. Additionally, the emergence of stablecoins could increase Treasury demand, though concerns remain about potential risks if these digital assets are not properly managed.

Under its new chair, Kevin Warsh, the Federal Reserve could contribute to addressing market fragility by developing emergency tools. However, Warsh has expressed a preference for monetary tightening and reduced forward guidance, policies that could potentially increase borrowing costs in the short term.

Despite regulatory reforms aimed at bolstering confidence in U.S. government bonds, experts caution that instability may persist absent more disciplined fiscal policy and consistent governance. Continued large deficits and unpredictable policymaking risk provoking market reactions that could compel the government to adopt more stringent fiscal measures in the future.