The International Monetary Fund published staff research arguing that the traditional diversification benefit of holding stocks and sovereign bonds has weakened since 2020, as the two asset classes have increasingly sold off together during episodes of sharp market stress. The analysis warns this shift leaves classic 60 percent equity and 40 percent bond allocations and leveraged risk parity style strategies more exposed to shocks, with potential financial stability implications if volatility triggers funding strains and forced deleveraging. The research traces a turning point in stock bond correlations to around end 2019, noting that the post pandemic inflation shock coincided with more frequent joint selloffs in equities and bonds, particularly in the United States and to varying degrees in Germany, Japan, and the United Kingdom. It links the diminished hedging role of government bonds to higher term premiums amid inflation above target and to increased bond supply associated with widening fiscal deficits, with issuance outpacing central bank balance sheet runoff so that a larger share must be absorbed by price sensitive private investors. As investors look for alternative hedges, the analysis points to sharp rallies in precious metals and certain currencies, citing gold more than doubling since the start of 2024. On policy, it argues that central bank interventions can stabilize bond markets in extreme stress but are not a durable substitute for restoring bonds’ safe haven characteristics, which it ties to fiscal discipline and commitment to price stability. It also calls for regulators to incorporate stock bond correlation breakdown scenarios into stress tests, given that risk models calibrated on historical correlations may underestimate current risks.

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