Yield curve inversion occurs when short-term bond yields exceed long-term yields, flipping the normal relationship. It is the bond market's strongest signal that investors expect economic trouble ahead β they accept lower long-term returns because they believe the Fed will be forced to cut rates due to a weakening economy.
Recession Prediction Track Record
The 2Y-10Y inversion has preceded every U.S. recession since 1955, with only one false signal (1966). The 3M-10Y spread, used by the NY Fed's recession probability model, has an even stronger track record. However, the lag is variable: recessions have started anywhere from 6 to 24 months after inversion.
The 2022-2024 Inversion
The 2Y-10Y spread inverted in March 2022 and reached -108 basis points in July 2023 β the deepest inversion since 1981. It remained inverted for 793 consecutive days (a record), finally un-inverting in September 2024. The fact that no official recession occurred during this period led to debate about whether the signal's reliability has diminished.
Why Inversion Occurs
Short-term yields are tied closely to the Fed's current rate. Long-term yields reflect expectations for future rates plus a term premium. When the Fed raises rates aggressively but markets expect eventual rate cuts (due to expected economic weakness), short rates exceed long rates.
Market Implications
Bank stocks typically underperform during inversions because banks' borrow-short/lend-long model sees squeezed margins. Defensive sectors (utilities, consumer staples, healthcare) tend to outperform. The un-inversion (steepening from inverted) historically marks the period closest to recession onset β not the inversion itself.