NextFin News - The traditional playbook for global crises—sell stocks, buy U.S. Treasuries—disintegrated this week as the outbreak of war between the United States and Iran sent bond yields climbing alongside oil prices. In a startling departure from historical "flight-to-quality" behavior, the benchmark 10-year Treasury yield rose to 4.094% on March 10, even as geopolitical tensions reached their highest point in decades. The failure of government debt to provide a cushion for investors suggests that the market’s fear of war-induced inflation now outweighs its desire for the perceived safety of the U.S. dollar.
U.S. President Trump launched a military strike in Iran on February 28, effectively initiating a conflict that has since shuttered the Strait of Hormuz and sent crude oil prices surging past $100 a barrel. Under normal circumstances, such a shock would trigger a massive influx of capital into the Treasury market, driving yields down. Instead, the 2-year Treasury note yield remained stubbornly high at 3.557%, while the 30-year bond added more than two basis points to reach 4.727%. This decoupling stems from a "fat tail" risk that investors can no longer ignore: the prospect of a supply-side energy shock that forces the Federal Reserve to keep interest rates elevated despite a slowing economy.
The mechanics of this failure are rooted in the specific nature of the conflict. Because the war directly threatens energy infrastructure, it acts as a massive inflationary tax on the global economy. According to data from CNBC, the closure of the Strait of Hormuz led to immediate production slashes from Iraq, Kuwait, and the United Arab Emirates. For bondholders, the math is punishing. If oil remains at triple digits, the resulting spike in consumer prices erodes the fixed-income returns of Treasuries, making them a poor hedge against the very crisis they are meant to mitigate. Ian Lyngen, head of U.S. rates strategy at BMO Capital Markets, noted that the cost of the military operation itself adds another layer of pressure, as investors worry the Treasury Department will need to increase auction sizes to fund the war effort.
This shift in market sentiment has left diversified portfolios exposed. For decades, the inverse correlation between equities and bonds served as the bedrock of risk management. However, as the FTSE 100 and S&P 500 recorded their sharpest declines since late 2025, the simultaneous drop in bond prices meant there was nowhere for capital to hide. Gold and certain technology-driven "AI disruption" themes have attempted to fill the void, but they lack the depth and liquidity of the $27 trillion Treasury market. The result is a period of extreme volatility where the "safe haven" label feels more like a relic of a pre-inflationary era.
While U.S. President Trump recently signaled to reporters that the conflict could be over "very soon," the damage to the Treasury’s reputation as a universal hedge may be lasting. Even as oil prices saw a slight pullback on Tuesday following these comments, yields remained significantly higher than their pre-war levels. The market is now pricing in a reality where geopolitical conflict is synonymous with fiscal expansion and inflationary pressure, rather than a simple contraction in risk appetite. For the global financial system, the realization that the world’s most liquid asset can fail during a moment of maximum peril marks a fundamental shift in how risk will be priced for the remainder of the decade.
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