The Ups and Downs of Small Caps and Inflation

Inflation, like other macroeconomic factors, can influence the performance of equity markets. Inflation’s impact varies across different segments of the markets and with both its level and trend. We focus here on small-cap stocks.

By the end of 2022, inflation had peaked across most of the developed world and has followed a downward trajectory over the first half of 2023. Inflation generally remains, however, above the 2% level — the target rate for central banks in many advanced nations. Based on the latest OECD data, the consumer price index (CPI) in the OECD countries was 5.7% in June,¹ and the Bureau of Labor Statistics reported that U.S. CPI was 3.2% in July.²

Inflation and small-cap performance through the decades

To analyze the impact of inflation level on small-cap performance, we studied the nearly 50-year period from December 1975 through June 2023. We found that the MSCI World Small Cap Index outperformed the MSCI World Index by 0.47% per month in periods of low inflation (CPI < 2%) and by only 0.09% in periods of high inflation (CPI > 2%).

We also looked at how the inflation trend has impacted small-cap performance. We focused on high-inflation regimes only, which we divided into subperiods of rising and falling inflation. Small caps underperformed on average by 13 basis points (bps) per month when inflation was rising and outperformed by 22 bps per month when inflation was falling.

These results are in line with the expectation that easing inflation coincides with economic growth and that smaller companies tend to benefit in early phases of the business cycle. The historical performance of small caps as inflation levels and trends have shifted may provide useful context for investors seeking to align their portfolios with their inflation expectations.