BY COMFORT OGBONNA
A sharp selloff in government bonds is raising fresh concerns across global financial markets and challenging one of the core assumptions behind modern investing — that high-quality government debt can protect portfolios during periods of stock market weakness.
Long-dated U.S. Treasury bonds and other sovereign debt instruments have faced sustained pressure since the outbreak of the Iran war, as investors increasingly demand higher compensation for inflation risks, strong economic growth, and a growing supply of government debt linked to expanding fiscal deficits.
The shift has pushed long-term Treasury yields sharply higher in recent weeks. The yield on the 30-year U.S. Treasury bond climbed well above the psychologically important 5% level this month before attracting renewed buying interest, signaling growing unease among investors about the long-term outlook for inflation and government borrowing.
At the same time, the relationship between stocks and bonds has changed significantly. The 60-day correlation between returns on the S&P 500 and U.S. Treasuries has reached its highest level in more than two decades, meaning that bonds are increasingly moving in the same direction as stocks instead of acting as a stabilizing force during market turbulence.
That trend is undermining the traditional “60/40” investment strategy, where investors typically allocate 60% of a portfolio to equities and 40% to bonds. For decades, the model relied on bonds to provide steady income and offset losses when equities declined.
Normally, Treasury prices tend to rise when stocks fall, creating what investors call a negative correlation between the two asset classes. That dynamic has historically helped reduce volatility and cushion investment portfolios during economic downturns or market shocks.
However, analysts say that relationship has weakened considerably in the current environment, where inflation remains elevated and central banks are under pressure to keep interest rates higher for longer.
Jonathan Cohn, head of U.S. rates desk strategy at Nomura, said the value proposition of bonds within diversified portfolios is being increasingly challenged as the traditional negative correlation between equities and fixed income has effectively disappeared.
The problem has been building for several years. Since 2021, inflationary pressures triggered by the aftermath of the COVID-19 pandemic, supply chain disruptions, and aggressive fiscal stimulus have reshaped global markets and forced central banks to tighten monetary policy sharply.
More recently, rising oil prices linked to the Iran conflict and disruptions around the Strait of Hormuz have intensified fears that inflation could remain stubbornly above central bank targets for longer than previously expected.
Those concerns have complicated the outlook for policymakers, who may find it difficult to cut interest rates aggressively even if economic growth slows, because easing policy too quickly could reignite inflation.
For many investors, the bigger issue is not simply that yields are rising, but that bonds may no longer provide the diversification benefits they once offered during periods of uncertainty.
John Luke Tyner, head of fixed income and portfolio manager at Aptus Capital Advisors, said bonds cannot necessarily be relied upon to hedge investment portfolios when inflation is both high and volatile.
Fiscal concerns are also adding to pressure on long-term government debt. Investors have become increasingly sensitive to the rising cost of servicing U.S. debt, expectations for larger Treasury issuance, and the possibility that persistent government deficits will require higher “term premiums” to attract buyers.
Term premiums represent the extra compensation investors demand for holding long-term debt when they perceive greater uncertainty surrounding inflation, fiscal policy, or future interest rates.
Analysts said the investment landscape may now be shifting toward an environment where long-dated bonds need to offer substantially higher yields in order to compete with equities and other risk assets that continue to generate stronger returns.
This has become particularly relevant as enthusiasm surrounding artificial intelligence fuels record corporate investment and stronger earnings expectations, driving major stock indexes to repeated all-time highs.
Many investors now see equities — especially technology and AI-linked companies — as offering significantly better long-term return potential than bonds, despite the higher risks involved.
Tyner described bonds as “certificates of confiscation” in terms of real purchasing power, arguing that inflation continues to erode the value of fixed-income returns over time.
Meanwhile, strong gains in equity markets have encouraged more investors to shift capital toward stocks, especially as many major indexes continue posting double-digit annual returns fueled by optimism over AI growth and resilient corporate profits.
The evolving relationship between stocks and bonds is forcing portfolio managers to reconsider long-standing investment strategies and rethink how diversification works in an era marked by persistent inflation, rising fiscal pressures, geopolitical instability, and rapidly changing monetary policy expectations.
Analysts warn that if inflation remains elevated and government borrowing continues to expand, the traditional role of Treasuries as a reliable market hedge could remain under pressure for years to come.
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