The International Monetary Fund published analysis warning that the traditional diversification benefits of holding both equities and sovereign bonds have weakened since the pandemic period, with the two asset classes increasingly selling off together during sharp market corrections. The IMF argues this co-movement can amplify portfolio losses and create broader financial stability concerns by intensifying deleveraging dynamics when volatility spikes. The analysis finds a turning point in stock-bond correlations around the end of 2019, with the shift particularly evident in the United States and, to varying degrees, Germany, Japan, and the United Kingdom. Classic strategies such as 60/40 portfolios and leveraged risk-parity approaches become more vulnerable when bonds no longer offset equity risk, raising the risk of forced deleveraging for hedge funds and greater volatility for pension funds and insurers. It links the breakdown in hedging properties to inflation surprises and rising term premiums amid large sovereign issuance to fund widening fiscal deficits, alongside central bank balance-sheet runoff that leaves more supply to be absorbed by price-sensitive private investors, a gap that has become more evident since late 2023. The note also points to investors seeking alternative safe havens, citing gold more than doubling since the start of 2024 and late-2025 gains in platinum and palladium. On policy, the IMF cautions that central bank interventions to stabilize bond markets during extreme stress have limits and can weaken market discipline if relied upon repeatedly. It frames restoring sovereign bonds’ hedging role as requiring credible fiscal frameworks and a commitment to price stability, and calls for regulators to incorporate correlation-breakdown scenarios into stress tests so institutions do not rely on models calibrated to historical relationships.

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