What is the Yield Curve Inversion?
The yield curve plots interest rates across maturities, and the spread between the 10-year and 2-year US Treasury is the single most reliable recession indicator in modern finance. Normally longer bonds yield more than shorter ones, producing a positive spread. When short-term rates rise above long-term rates the curve inverts, producing a negative spread. This inversion reflects a market betting that the central bank will have to cut rates in the future to rescue a weakening economy. Campbell Harvey documented in the 1980s that curve inversion preceded every US recession, and the signal has held ever since, correctly flagging the downturns of 1990, 2001, 2008 and 2020. The radar converts the spread into basis points: a reading well above zero indicates a healthy, upward-sloping curve, while a negative reading is a flashing warning that a recession may arrive within roughly six to eighteen months. Because the lag is long and variable, the curve is a strategic risk gauge rather than a precise timing tool.
Formula & Methodology
Created by Campbell Harvey (1986 doctoral research).
Historical Performance & Limitations
The lead time between inversion and recession varies from six to twenty-four months, making it useless for precise timing. Central bank bond buying can distort the curve, and some argue quantitative easing has weakened the signal. Inversions have also produced occasional false alarms.
Status Classification
| Level | Meaning |
|---|---|
| Strong Undervaluation | Market trading significantly below historical average |
| Fair Value | Market aligned with historical valuation metrics |
| Moderate Overvaluation | Market elevated above historical norms |
| Severely Overvalued | Extreme historical deviation; high downside risk |