Finance & Development – IMF
In this March 2026 article, Anil K. Kashyap and Jeremy C. Stein analyze emerging vulnerabilities in the U.S. Treasury market. Traditionally viewed as the most liquid and stable financial market, it has recently shown signs of fragility. Episodes such as March 2020 and April 2025 demonstrate that even this core market can experience severe dysfunction. As the supply of government debt continues to grow, the authors argue that market structure has not adapted sufficiently, increasing systemic risk.
Structural fragility in a growing market
The Treasury market has expanded significantly, with publicly held debt approaching 100 percent of GDP and projected to rise further. However, traditional intermediaries, especially broker-dealers, have not increased their balance sheet capacity at the same pace. Post-2008 regulations and stricter risk management have made it costly for them to hold large inventories of securities.
At the same time, institutional investors such as pension funds and mutual funds have taken a more prominent role. These actors often seek exposure to interest rates through derivatives rather than holding cash bonds. As a result, market functioning increasingly depends on complex interactions between derivatives and cash markets.
The role of leverage and market instability
A key source of fragility is the reliance on highly leveraged arbitrage strategies. Hedge funds, for example, engage in “basis trades,” buying Treasury bonds while selling futures contracts. These positions are often financed through short-term borrowing, with leverage reaching up to 99 percent.
Under normal conditions, this system helps align prices across markets. However, it becomes unstable during periods of stress. When volatility rises, hedge funds may be forced to unwind positions rapidly. This leads to fire sales of Treasury securities, widening spreads, and a sharp decline in market liquidity.
The events of March 2020 illustrate this dynamic clearly. As investors sought liquidity, even Treasury securities were sold aggressively. Dealers, constrained by balance sheet limits, could not absorb the flow. Consequently, the Federal Reserve intervened with large-scale purchases to restore market functioning.
Rethinking central bank intervention
The authors argue that while central bank intervention is necessary in extreme cases, current tools are too blunt. During the 2020 crisis, the Federal Reserve purchased approximately $1.6 trillion in Treasury securities. Although effective, these actions resembled quantitative easing and blurred the distinction between market support and monetary policy.
To address this issue, the authors propose a more targeted approach. Instead of unhedged bond purchases, the central bank could conduct hedged interventions. This would involve buying Treasury securities while simultaneously taking offsetting positions in derivatives. Such a strategy would stabilize markets without altering overall interest rate exposure.
This approach offers several advantages. It reduces pressure on dealer balance sheets, limits unintended monetary signals, and lowers the risk of financial losses. In addition, it allows policymakers to intervene precisely where dysfunction arises.
Balancing intervention and moral hazard
Central bank backstops can create moral hazard by encouraging excessive risk-taking. If market participants expect intervention, they may increase leverage. However, the authors argue that hedged interventions reduce this risk compared to traditional approaches.
A “penalty-rate” framework could further mitigate moral hazard. Under this system, the central bank intervenes only when market conditions become severely dysfunctional, allowing some private losses to occur. This preserves market discipline while preventing systemic collapse.
The article concludes that Treasury market instability is not accidental but rooted in its evolving structure. As debt levels rise and financial intermediation becomes more complex, the need for better-designed intervention tools becomes increasingly urgent.
Reference
Kashyap, A. K., & Stein, J. C. (2026, March). Safeguarding the treasury market. Finance & Development, International Monetary Fund. https://www.imf.org/en/publications/fandd/issues/2026/03/safeguarding-the-treasury-market-jeremy-stein