What the yield curve is
The yield curve plots the yields of US Treasury securities across different maturities — from 3 months to 30 years. The shape of this curve encodes the bond market's collective expectation of future economic growth, inflation, and monetary policy.
A normal (upward-sloping) yield curve: long-term yields are higher than short-term yields. This is the default because lenders demand higher compensation for tying up money for longer. It signals that the market expects normal growth and a stable policy environment.
A flat yield curve: short and long rates are nearly equal. Typically signals uncertainty — the market isn't sure whether growth will accelerate or decelerate. Often a transitional state.
The most watched yield curve metric is the difference between the 10-year and 2-year Treasury yields (10-2 spread). When this spread turns negative (inverts), it has preceded every US recession since the 1960s with no false positives, typically with a 6-18 month lead.
Curve inversion and recession
An inverted yield curve (short rates above long rates) is unusual and reflects a specific expectation: the market believes the Fed will have to cut rates in the future (either because it's hiked too far, or because growth will deteriorate significantly). The 2-year yield, which closely tracks near-term Fed policy expectations, rises above the 10-year, which reflects long-term growth.
The mechanism: when short rates are high and lenders can get 5%+ on 3-month T-bills, they have less incentive to lend long-term to consumers and businesses. Credit conditions tighten. Investment and consumer spending slow. Unemployment eventually rises. Recession follows.
Important nuance: the inversion predicts recession but not timing. The 2022 inversion was one of the deepest in decades, yet the economy remained resilient into 2023 and beyond as pandemic-era savings supported spending. The lag between inversion and actual recession can be a year or more — the curve is a signal, not a precise timer.
Steepening and flattening
Curve steepening (long rates rising more than short, or short rates falling more than long) is typically bullish for risk assets. It signals that the market expects growth and inflation, or that the Fed is beginning to ease. Banks particularly benefit because they borrow short and lend long — a steeper curve improves their margins.
Bear steepening (long rates rise faster than short rates, often because of inflation or supply concerns) is more complex — it's not necessarily bullish. The 2023 period of bear steepening (10-year rising while Fed held short rates high) was driven by fiscal concerns and term premium expansion.
Bull steepening (short rates fall faster than long rates) is the most reliably bullish curve dynamic — it reflects Fed cutting or expectations of cutting, which eases financial conditions. Bank stocks, housing-related equities, and leveraged companies all historically outperform in bull steepening environments.