Inflation shocks and equity factor returns
Inflation shocks and equity factor returns.
Equity factors such as value, momentum, and quality are widely used by investors seeking repeatable sources of return. Over long horizons, these factors have demonstrated robustness across sectors, market capitalisations, and geographies. However, long-term averages can obscure meaningful regime-dependent behaviour - particularly during periods of elevated and rising inflation.
As John Maynard Keynes famously observed, “in the long run we are all dead.” For investors concerned with portfolio positioning through inflation shocks, the short- and medium-term behaviour of equity factors matters.
Lessons from the Inflationary 1970s
The 1970s provide a useful historical reference point. This period was characterised by persistent inflation, rising interest rates, supply shocks, and weak economic growth. Equity market leadership shifted meaningfully during this regime.
As shown in the accompanying exhibit, value-oriented equities and real assets performed relatively well, while long-duration assets - including long-dated government bonds and quality equities - experienced significant drawdowns.
Factor and Asset Class Returns vs. US Equties, 1971 - 1981
Source: SEI QiM, using data from FRED and Ken French’s data library.
Duration Sensitivity and Valuation Effects
At a high level, the relative performance of value and quality during inflationary episodes can be understood through duration.
- Value stocks, typically characterised by lower valuation multiples, embed a shorter duration of cash flows. Their present value is therefore less sensitive to changes in discount rates.
- Quality stocks, often trading at higher multiples, derive a larger share of their valuation from cash flows expected further into the future. Rising inflation and interest rates increase discount rates, disproportionately compressing these valuations.
Inflation and Corporate Fundamentals
Beyond valuation mechanics, inflation also affects companies through the income statement.
Quality businesses - defined broadly as firms with high and stable profitability - often rely on durable competitive advantages, or “economic moats.” These may stem from brand strength, network effects, scale, or regulatory barriers. While such advantages can be long-lasting, they are rarely permanent.
During inflationary periods, these businesses can face a double headwind:
- Input costs rise, pressuring margins.
- Consumers face real income erosion, limiting pricing power.
The result is often a combination of margin compression and valuation derating, reinforcing the negative impact on quality-style returns during inflation shocks.
Is “This Time Different”?
Each inflationary episode is shaped by its own catalysts. Nevertheless, history suggests that when inflation and interest rates adjust higher, factor leadership can shift in predictable ways.
Across inflationary regimes, assets and styles with shorter duration characteristics - including value equities and real assets - have tended to fare better than long-duration growth and quality exposures.
YoY US Inflation Rate Comparison, 1966 - 1982 vs 2013 - 2026
Notable periods:
12/76 - OPEC announces price increases
02/79 - Iranian Revolution
05/81 - Fed hikes 100 bp to a record 14%
Source: SEI QiM; data from FRED. Conceptual framing inspired by work discussed by Niall Ferguson, Hoover Institution.
Portfolio Implications
For equity investors navigating inflation uncertainty, the key takeaway is not to abandon quality entirely, but to recognise regime sensitivity:
- Valuation discipline matters more when discount rates are rising.
- Exposure to shorter-duration cash flows can improve portfolio resilience.
- Factor diversification, rather than reliance on a single style, remains critical.
Inflation regimes challenge long-held assumptions. Understanding how factor returns behave under these conditions can help investors position portfolios more deliberately - without relying on the hope that the long run arrives quickly.
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