Preparing Portfolios for Resilience Against Inflation Surprises

Many investment portfolios that rely heavily on stock-bond diversification to manage risks may not be protected against inflation surprises. Real assets offer a solution.

Inflation in the U.S. has accelerated from near zero in 2015 to 2.5% in 2018 (according to the Consumer Price Index or CPI), propelled by trade tensions, strong consumer spending, the tight labor market, and a boost in growth from tax reform and other fiscal stimulus. After so many years of low inflation, the rise in 2018 points to the possibility of an inflation surprise.

Such a surprise could be damaging because many investors may be too reliant on diversification achieved by investing in a portfolio of stocks and bonds, which is predicated on the historical negative correlation between the two asset classes. However, this diversification may not work as well going forward because correlation between stocks and bonds tends to rise when inflation is elevated. Therefore, we suggest investors consider real assets (inflation fighters) to make portfolio diversification more robust and hedge against the risk of higher inflation.

Will stocks and bonds deliver the same diversification at higher inflation rates?

The correlation between U.S. stocks and bonds has been low or negative when inflation has been low to moderate. Over the past couple of decades of low inflation, portfolios that were diversified across nominal bonds and stocks therefore tended to fare well on a risk-adjusted basis. It is this positive experience that is shaping most investors’ approach to inflation today.

However, this might not be the best way to address inflation risk going forward: Stock-bond correlations tend to increase when inflation is either high or rising, as shown in Figure 1. This could be a big problem for investors worried about inflation because positive correlations essentially mean less effective portfolio diversification.

U.S. stock-bond correlations typically increase

We believe inflation in the near future will be higher than in the recent past. U.S. CPI inflation has been above 2% for 12 consecutive months, and core personal consumption expenditures (PCE) is at the threshold of the Federal Reserve’s target of 2%. Since inflation is a lagging economic indicator, one may reasonably expect inflation to remain elevated in the next few quarters, reflecting the current acceleration in U.S. economic growth. PIMCO’s latest Cyclical Outlook forecasts U.S. inflation in the 2.0%–2.5% range in 2019. Furthermore, the possibility for inflation surprises has increased as the Federal Reserve, along with other major central banks, appears more comfortable with inflation running at or above the target, meaning that central banks are less likely to hit the brakes on growth even if inflation overshoots for some time.