Line up bonds from the same issuer by how long until they mature, plot their yields, and you get the yield curve. Its shape is one of the most-watched signals in all of finance.
What it shows
The yield curve plots yield against maturity — say, 3-month, 2-year, 10-year, and 30-year government bonds. Each point is the going yield for lending over that length of time.
The normal shape: upward
Usually the curve slopes up: longer loans pay more. That makes sense — lending for 30 years ties up your money longer and carries more uncertainty (inflation, rates) than lending for 1 year, so investors demand extra yield for the wait. A gentle upward slope is the healthy, normal state.
Flat and inverted
The curve isn’t always upward:
- Flat — short and long yields are similar; the market is unsure where rates are heading.
- Inverted — short-term yields rise above long-term ones. This is unusual: investors are accepting less yield to lock in long bonds, often because they expect rates (and growth) to fall.
Why an inversion gets attention
An inverted yield curve has, historically, often appeared before recessions — so economists and markets watch it as a warning sign. It’s a signal, not a guarantee: inversions don’t cause downturns, and they don’t always precede one. But a curve that flips upside down tends to make everyone nervous.
The takeaway
The yield curve plots yields across maturities. It normally slopes up (longer = more yield); when it inverts (short above long), it’s a closely-watched — if imperfect — signal that markets expect weaker growth ahead.