Stock-Bond Diversification Offers Less Protection From Market Selloffs

IMF Blog, February 18, 2026

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Diversification between stocks and bonds has weakened since 2020, with stocks and bonds increasingly moving in tandem during sharp selloffs.
The classic portfolio example cited: "60 percent stocks and 40 percent bonds."
Authors: Tobias Adrian, Johannes Kramer, Sheheryar Malik. Publication date: February 18, 2026.

Turning point in correlations: "around the end of 2019."
Historical period of inverse relationship: "From 2000 to 2019, the inverse relationship between expected stock and bond returns helped investors effectively manage risk."
Since 2020, both stocks and bonds tend to sell off concurrently in response to rising market stress, reinforcing equity risk in the United States and, to varying degrees, Germany, Japan, and the United Kingdom.
The simultaneous falls in both assets "may explain the severity of recent market selloffs: losses compound when both assets fall together."
Commodities and currencies showing increased safe-haven demand: gold, silver, platinum and palladium, and currencies such as the Swiss franc.
- Example: "Gold... has more than doubled since the start of 2024."
- "Platinum and palladium jumped in the final quarter of last year."

Inflation and supply shocks since the start of the pandemic reduced bonds’ hedging effectiveness.
Rising expected bond returns coinciding with higher volatility as investors reprice term premiums, with bond prices "declining steeply in the current period."
Fiscal factors:
- "Expanding bond supply to finance widening fiscal deficits across most advanced economies."
- Gross issuance of bonds has "outpaced central bank balance-sheet runoff."
- Since "late 2023" central banks’ balance sheet runoff slowed while issuance stayed elevated.
- The supply absorbed is "many times larger than the reduction in central bank holdings over the past few years in the four largest advanced economies."
Inflation remaining above target in many economies raises term premiums and weakens bonds’ suitability for hedging.
Corporate capital investment financed increasingly by debt issuance could reinforce upward pressure on term premiums unless offset by greater productivity growth.

Traditional hedges (stocks vs. sovereign bonds) provide "diminished protection," increasing portfolio volatility during market corrections.
Levered strategies and liquidity-sensitive funds:
- Hedge fund and risk parity strategies that "employ leverage based on the historical relationship are now increasingly moving in tandem with Treasury returns," raising vulnerability to forced deleveraging.
Conservative institutional investors (pension funds and insurers) could face greater portfolio volatility in corrections.
Market dynamics: corrections are sharp and accompanied by surges in stock market volatility, which can worsen funding constraints and force deleveraging, amplifying systemic vulnerabilities.

Central banks:
- Will "undoubtedly intervene to stabilize bond markets during periods of extreme stress, but this has limits."
- Must "commit to ensuring price stability." The unexpected rise of inflation since 2020 is highlighted as a key contributor to the correlation reversal.
Fiscal policy:
- Restoring hedging properties of sovereign bonds "requires fiscal discipline."
- "Without credible fiscal frameworks, bonds cannot serve as reliable anchors in turbulent markets."
Regulatory actions:
- "Regulators should also incorporate correlation breakdown scenarios into stress tests."
- Financial institutions must prepare for "traditional diversification to fail," since models calibrated on historical correlations may underestimate new risks.
Caution about reliance on emergency measures: relying on emergency interventions "can lead to excessive risk-taking and undermine market discipline."

Investors need to "build portfolios that account for the shift in correlations."
Alternative strategies mentioned: "incorporating commodities or private assets," noting they "may offer partial solutions, but they come with their own complexities and risks."
Longer-run remedies: greater productivity growth could reduce inflation and allow governments to issue bonds with shorter maturities, mitigating some term premium pressures.

Source: IMF blog post "Stock-Bond Diversification Offers Less Protection From Market Selloffs" (February 18, 2026).