A sharp selloff in government bonds is challenging one of the foundational principles of modern investing: the belief that high-quality sovereign debt acts as a reliable hedge during equity market downturns. Instead of cushioning portfolios amid rising geopolitical tensions and market volatility linked to the Iran war, long-dated U.S. Treasuries have come under sustained pressure as investors demand higher compensation for inflation risks, stronger economic growth and expanding fiscal deficits.
The yield on the benchmark 30-year U.S. Treasury bond climbed well above the 5% mark this month before attracting some buying interest, highlighting the extent of investor concern around long-term debt. According to Reuters, the relationship between stocks and bonds has also shifted sharply, with the 60-day correlation between the S&P 500 and Treasury returns reaching its highest level in more than two decades. This means bonds are increasingly moving in the same direction as equities rather than offsetting market losses.
The changing dynamic is raising questions about the effectiveness of the traditional 60/40 portfolio allocation strategy, where investors typically place 60% of assets in equities and 40% in bonds to balance growth with stability. The model relies heavily on the assumption that Treasury prices generally rise when stock markets weaken, creating diversification benefits during periods of market stress.
Reuters cited experts, who said the role of bonds as a portfolio stabilizer has become increasingly uncertain as the historical negative correlation between equities and bonds has weakened significantly.
Market participants say the shift began taking shape in 2021 after inflation surged globally following pandemic-related supply disruptions and aggressive fiscal stimulus measures. The situation has intensified again due to rising oil prices linked to the Iran conflict, reviving fears that inflation could remain persistently above central bank targets for longer than expected.
Many investors are now concerned that elevated inflation could limit the U.S. Federal Reserve’s ability to cut interest rates even if economic growth slows. In such an environment, bonds may no longer provide the protection investors traditionally expected during periods of market weakness.
Another expert told Reuters that bonds may struggle to hedge portfolios effectively in an environment where inflation remains high and volatile.
Apart from inflation worries, growing fiscal concerns are also weighing on long-term Treasuries. Investors are paying closer attention to the rising cost of servicing U.S. debt, the prospect of increased Treasury issuance and the risk that persistent fiscal deficits could push term premiums higher. The term premium, the extra yield investors demand to hold longer-dated debt due to greater uncertainty, on 10-year Treasury notes has risen sharply in recent months.
Analysts told Reuters that investors are increasingly questioning the long-term stability of the U.S. dollar and the sustainability of large fiscal deficits compared with perceptions held several years ago.
Despite the concerns, most investors are not abandoning U.S. Treasuries altogether. The American government bond market remains the largest and most liquid in the world, and many portfolio managers still view it as a core component of diversified investment portfolios. However, investors are becoming more selective about duration exposure, with several preferring shorter-term bonds over longer-dated securities.
The appeal of long-term bonds is facing fresh competition from equities, especially as investors continue to price in strong corporate earnings growth fueled by heavy spending on artificial intelligence and technological expansion. With stocks delivering significantly stronger returns in recent years, some investors believe long-term bonds may need to offer substantially higher yields to remain competitive.
