What an Inverted Yield Curve Means for the Economy

One key predictor of downturns in the economy is what is known as the yield curve. This typically refers to the market for what the US government borrows, by issuing bonds and other securities that mature over different time horizons ranging from weeks to 30 years.

Each of these securities has its own yield (or interest rate), which moves up and down in inverse proportion to the security’s market value, so when bonds are trading at high prices, their yields will be low and vice versa. You can draw a chart that plots the yields of securities at each maturity date to see how they relate to one another, and this is known as the yield curve.

In normal times, as a compensation for higher risk, investors expect expect higher rates of interest for money they lend over a longer time horizon. To reflect this, the yield curve normally slopes up. When it instead slopes down—in other words, when it inverts—it is a sign that investors are more pessimistic about the long term than short term: they think a downturn or a recession is coming soon.

This is because they expect the Federal Reserve, the US central bank, is going to cut short-term interest rates in future to stimulate a struggling economy (as opposed to raising rates to cool down an economy that is overheating).

Most closely watched is the relationship between two-year and ten-year US treasury debt. The so-called spread between these two metrics can be seen in the chart below, with the grey areas indicating recessions that have tended to follow shortly after.

Spread between two-year and ten-year treasuries

As you can see, the yields of these two securities are getting very close to being the same, and the trend suggests that the two-year will soon have a higher yield, meaning the curve is inverting. The key question is, does an inverted yield curve hint at an upcoming downturn? Not necessarily. Let me explain why.

Inflation expectations

One complication is that bond yields don’t only reflect what investors think about future economic growth. They also buy or sell debt securities depending on what they think is going to happen to inflation. It’s generally assumed that prices will increasingly rise in the years ahead, and investors need to be compensated for bearing that risk, since higher inflation will erode their future purchasing power. For this reason, bond yields contain an element of inflation premium, normally with an increasingly higher premium for bonds with longer maturity dates.

The following chart shows the spread between the inflation expectations built into 10-year and 2-year treasuries. The fact that it is in negative territory suggests the market thinks that inflation may fall, and this may also explain why yields on longer-dated treasuries are lower than on shorter-dated ones. And although inflation would fall in the event of an economic slowdown or recession, there could be a situation where inflation fell but the economy remained buoyant. Hence a yield curve inversion doesn’t have to mean that we are up against an imminent recession.

Inflation expectations (ten-year vs two-year treasuries)