Yield Curve Explained

The yield curve is a map of what bond investors expect over time. Its shape, not just its level, is one of the most closely watched signals in markets.

What the yield curve actually plots

The yield curve plots the yields of government bonds across maturities, from short-term bills out to 30-year bonds, at a single point in time. Connect the dots and you get a line that usually slopes upward, because lenders typically demand more compensation to tie up money for longer.

The curve is really a snapshot of collective expectations: where investors think growth, inflation, and central bank policy are headed over the next few years and beyond. It moves constantly, and its shape changes far more meaningfully than any single yield in isolation. For background on what individual Treasury yields represent, see Treasury Yields Explained.

The normal curve: upward-sloping

A normal curve slopes up and to the right — short-term yields low, long-term yields higher. This is the default shape in a healthy expansion: investors expect the economy to keep growing, inflation to run at a normal pace, and the central bank to keep policy roughly steady or gradually tighten. The extra yield on longer maturities compensates for the extra risk and uncertainty of lending money for decades rather than months.

A steepening normal curve — long yields rising faster than short ones — often reflects rising growth or inflation expectations. It's usually read as a vote of confidence in future economic activity, though a very steep curve can also signal inflation concerns.

The flat curve: compression and uncertainty

A flat curve occurs when short- and long-term yields converge. This typically shows up late in an economic cycle, when a central bank has raised short-term rates aggressively while long-term yields fail to keep pace because investors expect growth and inflation to cool. A flattening curve is often the transition phase between a normal curve and an inversion — markets pricing in a slowdown but not yet fully committing to it.

The inverted curve: short above long

An inverted curve is when short-term yields sit above long-term yields — the line slopes downward instead of up. This is unusual: it means investors are willing to accept less annual return for locking money up longer, which only makes sense if they expect rates and growth to fall meaningfully in the years ahead. Inversion, particularly between the 2-year and 10-year Treasury yields, has a long history as a recession warning sign. The mechanics and track record of that signal are covered in detail in Yield Curve Inversion: Why It Matters.

Why shape matters more than level

Two curves can share the same 10-year yield and tell completely different stories depending on where short-term yields sit relative to it. The level of yields reflects where rates are today; the shape reflects where the market thinks the economy and policy are going. That's why traders, economists, and central bankers watch the spread between maturities — commonly the 2s10s or 3-month/10-year spread — as closely as the yields themselves. A rising 10-year yield alongside a flattening curve means something very different from a rising 10-year yield alongside a steepening one.