The Yield Curve and Its Inversion

Short rates above long rates — the market's oldest recession signal, and why it doesn't fire immediately.

In a normal world, tying money up for longer pays more: a 10-year bond yields more than a 2-year. The reason is simple — nobody knows what the next decade holds, and that uncertainty has a price.

Sometimes this reverses. Short-term rates rise above long-term ones. It is the most striking sentence the bond market ever utters, and it has preceded almost every US recession of the last fifty years.

Why It Inverts

The two ends price two different things. The rates and bonds article covers the mechanics; what matters here is the split:

The short end (2 years) reflects the Fed's policy rate today and in the near future. If rates are being raised to fight inflation, the short end rises.
The long end (10 years) reflects long-run growth and inflation expectations. If the market expects a slowdown, the long end falls.

An inversion is both happening at once: the Fed is tightening today, and the market expects a slowdown tomorrow. The curve is saying "this level of tightness cannot be carried for long; eventually rates come down."

That spread is called 2s10s in market shorthand, and it is this article's glyph.

The Signal's Actual Record

The reputation is earned: the curve has inverted before every US recession since the 1970s. With two caveats.

The lag is long and variable. Historically, six to twenty-four months have passed between inversion and the start of a recession. "The curve inverted, so sell" can look wrong for more than a year — and stocks can keep rising throughout.

The un-inversion is a signal too. The curve returning to normal (re-steepening) often lands just before the recession, because the normalisation usually comes from the short end falling — that is, the Fed starting to cut. A rate cut looks like something to celebrate; it is worth remembering what prompted it.

Which Spread

There is no single "yield curve"; different pairs of maturities give different signals:

Spread	What it reflects	Character
2s10s	Policy expectations vs growth expectations	The most quoted
3m-10y	Today's cost of money vs growth	Stronger in academic work
5s30s	Long-run inflation expectations	Less affected by policy

Two inverting together strengthens the signal; only one inverting is often technical.

What It Means for Stocks

An inverted curve is a direct problem for banks: a bank borrows short and lends long, so it lives off the spread. When the spread goes negative, the business model tightens.

For other sectors the effect is indirect, and it is the subject of the sector rotation article: an expected slowdown moves money from cyclical sectors into defensive ones.

Where You'll See It Here

The Treasury yield strip on Markets puts the 2, 5, 10 and 30-year yields side by side — you can read the shape of the curve straight off it: if the short rate is above the long one, the curve is inverted. The data comes from FRED and any publication lag is stated in the stamp. Macro shows how those series have moved over time.