The Yield Curve: A Famous Recession Signal

Normal Curve (Upward Slope)

Investors demand higher yields for longer bonds because of two risks:

• Duration risk: Bond prices fall if rates rise. If yields rise by 1 percentage point, a 10-year bond loses roughly 8–9% of its price; a 2-year bond loses roughly 2%.
• Inflation risk: Over 10 years, inflation could erode principal. Short-term bonds allow reinvestment in higher rates sooner.

For example, a 2-year yield of 3% and a 10-year yield of 4% is a spread of 1 percentage point (100 basis points). Part of that gap is the term premium: the extra yield investors want for locking up money for longer. The rest reflects where they expect short-term rates to go.

Inverted Curve (Downward Slope)

Short-term yields follow the central bank's policy rate closely. When the Fed raises rates sharply to fight inflation, short-term yields rise with it. Long-term yields reflect the average rate investors expect over the next ten years. If they think today's high rates will slow the economy and force cuts later, long yields rise less, or fall. Result: the 2-year yield ends up above the 10-year. The curve inverts.

Why is this read as a recession signal? An inverted curve says the bond market expects rates to be lower in the future. Central banks usually cut rates a lot only when growth weakens, so the market is effectively pricing in a slowdown.

A Good Record, Not a Perfect One

The 10-year/3-month curve inverted before each of the eight US recessions from 1969 to 2020. Two caveats matter. The 2020 recession was caused by the pandemic, which no bond market foresaw, so the 2019 inversion was arguably right by luck. And the curve has inverted without a recession following: in 1966, and again from 2022 to 2024, the longest and deepest inversion in decades, after which the US economy kept growing.

Lead Time Variability

When a recession did follow, it typically started 6 to 24 months after the first inversion, about a year on average. The curve inverted in 2006 and the recession began in December 2007. Key takeaway: even when the signal works, it says little about timing, and a recession often begins after the curve has already turned positive again.

Case Study: 2022–24, the Signal That Didn't Fire

The 2-year/10-year curve inverted in July 2022 as the Fed raised rates from near zero towards 5.25–5.5%. It stayed inverted until late summer 2024, more than two years. Many forecasters expected a recession in 2023. It did not come: households were spending savings built up during the pandemic, many borrowers had locked in low fixed mortgage rates, and employment kept rising. The episode is a reminder that an indicator's past record is evidence, not a guarantee.

How an Inverted Curve Can Feed a Slowdown

The curve is mainly a forecast, but economists also point to a channel through which it can add to a slowdown.Step 1: Bank margins shrink. Banks fund themselves at short-term rates and lend at longer-term ones. When the curve inverts, that margin narrows, and lending becomes less profitable, so banks tend to lend more cautiously.

Step 2: Credit Crunch. Tighter bank lending → businesses can't finance capex → hiring slows → unemployment rises → consumer spending drops.

Step 3: Slowdown. If demand falls far enough, output shrinks. In the US, the National Bureau of Economic Research (NBER) dates recessions, usually months after they have started.

A Steep Curve

When the curve is steep (2-10 spread > 100 bps), markets expect higher growth and inflation. Historically, shares and economically sensitive sectors have tended to do well in this phase, and long-dated bonds less so.

After an Inversion

When the 2-10 spread inverts (crosses 0), markets are signalling slower growth ahead. In past cycles, long-dated bonds and defensive sectors (utilities, consumer staples, healthcare) have tended to hold up better than cyclicals such as industrials and energy.

Re-Steepening

The curve usually re-steepens when the Fed starts cutting and short-term yields fall faster than long-term ones. Professionals call a position that benefits from this a "steepener". A re-steepening after an inversion has often coincided with the start of a recession rather than the end of the risk.