The quarter century from the mid-1990s to 2020 was defined by what investors came to treat as a permanent condition: low, stable, and manageable inflation. That assumption did not survive the early 2020s. In a new report from AQR's Portfolio Solutions Group, Pete Hecht, Antti Ilmanen, Thomas Maloney, and Nick McQuinn examine what the inflation regime shift means for portfolio construction1. The findings are sobering. The prescription is specific.
Not Many Investments Like Rising Inflation
Drawing on a 55-year dataset spanning 1972 to 2026, the Portfolio Solutions Group frames the inquiry plainly. "The quarter century from the mid-1990s to 2020 was a period of low and stable inflation," the authors note. "This era ended abruptly in the early 2020s, with a wave of inflation that caused a brief bear market." The central question is the right one: how should investors be thinking about inflation risk?
The starting answer is uncomfortable. "Not many investments 'like' rising inflation." Equities and nominal bonds both suffer when price pressures accelerate. The Group's methodology separates inflation surprises from growth shocks, revealing that the asset-class sensitivities investors rely on in benign environments can invert under inflationary conditions. What looks like diversification in calm markets can evaporate precisely when protection matters most.
When Stocks and Bonds Move Together
The correlation problem is structural, not temporary. The report identifies that stock-bond correlations have reached multi-decade highs, and the mechanism is critical: when inflation news dominates growth news, stocks and bonds move in the same direction. Bond diversification benefits erode exactly when inflation risks spike. For a generation of investors who built portfolios on the assumption that bonds provide ballast when equities sell off, this is a foundational challenge.
The Group is careful to distinguish between linear and non-linear responses across asset classes. Commodities and inflation-linked bonds show roughly linear inflation sensitivity, outperforming during inflation but underperforming during disinflation. That asymmetry is not a flaw to be avoided but a characteristic to be managed deliberately.
Three Tools, One Objective
The prescription is direct. "Investors should be cautious about aggressive tactical bets on the direction of inflation," the authors argue, pivoting instead toward strategic resilience. "Strategic allocations to inflation-linked bonds, commodities and trend following may help improve portfolio resilience."
Each tool carries a distinct profile. Inflation-linked bonds deliver direct breakeven exposure against core inflation shocks. Commodities, most effectively accessed through sector-balanced rather than energy-concentrated indices, capture carry, momentum, and fundamental signals across a broad opportunity set. Trend following stands apart as the most versatile of the three. It generated positive returns across both the 2008 Global Financial Crisis and the 2022 inflation shock, environments that punished nearly every traditional asset class. The starting portfolio produced a -24.5% return during the Global Financial Crisis and -8.9% during the 2022 inflation shock; the three-strategy combination substantially cushioned both events.
"Trend following in particular," the Group states, "is a versatile risk mitigator, having outperformed in both inflationary and disinflationary bear markets."
The Tail Risk No One Wants to Price
The report extends its view beyond the base case to longer-duration risks. De-anchored inflation expectations, not seen since the 1970s, pose a triple-whammy threat to Treasury yields: nominal impact, elevated inflation risk premiums, and rising term premiums converging simultaneously. The context is not academic. Challenges to Federal Reserve independence, elevated public debt, and volatile trade policy compound the probability of an extreme inflation scenario, even if it remains a tail rather than a central outcome. The Group treats this as a scenario to hedge, not to dismiss.
The Cost of Resilience
The Portfolio Solutions Group does not oversell the prescription. Adding inflation hedges introduces tracking error and organizational complexity. These strategies underperform during stable, low-inflation environments that have historically coincided with the strongest equity returns. The Group's "robust" optimal portfolio, incorporating all three diversifiers, generates an expected return approximately 70 basis points higher than the starting portfolio, alongside materially improved performance across stress scenarios. The cost of resilience is measured underperformance in calm conditions. The benefit is protection when it counts.
5 Key Takeaways for Advisors and Investors
1 The 60/40 portfolio's diversification logic breaks down under inflation regimes. Stocks and bonds lose their offsetting relationship precisely when investors need it, because both respond negatively to inflation surprises.
2 Tactical bets on inflation direction are unreliable. The Portfolio Solutions Group explicitly cautions against them. Strategic positioning and structural hedging outperform forecast-driven tilts over time.
3 Trend following is the most versatile inflation hedge available, generating positive performance across both inflationary and disinflationary bear markets. Its resilience profile is not one-sided.
4 Commodities work, but implementation matters. Sector-balanced exposure avoids the concentration risk and mean-reversion drag of energy-heavy indices and captures a wider signal set.
5 The tail risk of de-anchored inflation expectations carries real probability and should not be priced at zero. Fiscal expansion, central bank independence concerns, and trade volatility all point toward hedging this scenario rather than ignoring it.
Footnote:
1 Hecht, Pete, Antti Ilmanen, Thomas Maloney, and Nick McQuinn. "Inflation Redux? Real Solutions for Real Returns." AQR Alternative Thinking, Issue 3, 2026. AQR Capital Management. https://www.aqr.com/-/media/AQR/Documents/Alternative-Thinking/AQR-Alternative-Thinking-Q3-2026---Inflation-Redux.pdf
