Reading the Yield Curve

The basics

The yield curve plots bond yields against maturity. A normal (upward) curve compensates lenders for time and inflation risk; an inverted curve — short rates above long rates — has historically preceded US recessions. The inversion signal works through expectations: markets invert the curve when they expect the central bank to cut rates because growth is about to weaken, and those cuts drag long-dated yields below the current policy rate.

Why inversion matters

Inversion compresses bank lending margins and signals expected rate cuts. Since the 1970s every US recession was preceded by inversion, but leads are long and variable (6–24 months) and false positives exist. The mechanism is partly mechanical — banks fund long assets with short liabilities, so an inverted curve makes new lending unprofitable and tightens credit — and partly informational: the curve is a market forecast that has a strong track record against forecasters.

Beyond the headline

Watch the 2s10s spread and the 3-month/10-year spread (Fed-preferred), plus break-even inflation curves. Curve steepening after inversion often marks the approach to the downturn's end. Term premia — not just the slope — tell you how much compensation lenders demand for holding long duration. A curve that inverts via collapsing long yields (term-premium compression) means something different from one that inverts via aggressive policy hikes, and the distinction matters for positioning.

Reading pitfalls

• Yield-curve data is quoted with compounding conventions that differ by market — compare like-for-like.
• Shallow inversions that quickly re-steepen are weaker signals than persistent ones.
• The curve says nothing about timing; combine it with credit spreads and leading indicators for a decision, not an oracle.

References

• Estrella & Mishkin, Predicting U.S. Recessions: Financial Variables as Leading Indicators(academic)
• U.S. Treasury — Yield Curve Methodology and Data(regulatory)
• FRED — Daily Treasury Par Yield Curve Rates(industry)