Yield Curve
A plot of interest rates across different maturities for similarly-rated debt (typically government bonds). An inverted yield curve (short-term rates above long-term) has historically preceded recessions.
Yield Curve · the mechanism
1 min read
Read the shape of a curve, say what it implies about growth and policy, and avoid the two mistakes people make with inversion.
Where it comes up. A PM asks what the curve is telling you after a morning where the front end rallied and the long end barely moved.
Read the axes
Maturity along the bottom, yield up the side, one issuer and one credit quality throughout, normally government bonds, so the shape reflects rates and expectations rather than default risk. The 2-year is the market’s view of policy over two years; the 10-year blends expected policy far out with a term premium for holding duration.
Name the shape
Upward-sloping is normal: investors want paying for locking money away. Flat says the market expects no change in policy. Inverted, meaning short yields above long, says the market expects rates to be cut, which is a way of saying it expects the economy to weaken.
Separate the two ways a curve steepens
A bull steepener is short yields falling faster than long: cuts are coming. A bear steepener is long yields rising faster than short: growth or inflation expectations, or a term premium, are being repriced. The same word describes both and they mean opposite things, so always say which end moved.
Handle inversion carefully
Inversion has preceded every US recession since the 1960s, at a lag that has run from six months to two years. The lag is the point: it is not a timing signal. Note too that the curve typically re-steepens before the recession starts, so the disinversion is often the later and more informative signal.
Check yourselfThe 2-year yield falls 60bp and the 10-year falls 20bp. What has happened, and what is the market saying?
Answer once you have one →
The curve has bull-steepened: both ends rallied, the front end more. The market has brought forward or deepened its expectation of rate cuts, which usually means it has downgraded its view of growth or inflation. Note it is the front end doing the work. The same steepening driven by a 40bp rise in the 10-year would carry the opposite message.
Be able to say this back next week
- Said the front end prices policy and the long end blends policy with a term premium
- Distinguished a bull steepener from a bear steepener by which end moved
- Said inversion is a direction signal with a lead time of quarters, not a timing signal
Why Yield Curve matters in interviews
The curve is the single most-referenced picture in macro, and interviewers use it as a compact test of whether a candidate can reason about expectations rather than recite a headline. Almost everyone knows that inversion has preceded recessions. Far fewer can say what the front end and long end each represent, distinguish a bull steepener from a bear one, or explain why the disinversion is often the more informative moment.
How it works in practice
A yield curve plots yields for one issuer at one credit quality across maturities, so what it shows is the price of time rather than the price of risk. The front end is dominated by expected policy: the 2-year is close to the market’s average expected policy rate over two years. The long end blends expectations far out with a term premium, the extra yield demanded for bearing duration, which is not directly observable and is estimated by models that disagree with each other.
Four shapes carry four messages. Upward-sloping is the normal state. Flat says no change is expected. Inverted says cuts are expected, which is a way of saying weakness is expected. Humped, with the peak in the middle, typically appears late in a tightening cycle when the market expects one or two more increases followed by cuts.
The 2s10s and 3m10y measures both invert before recessions and do not always invert together; the 3m10y is more sensitive to actual policy and less to expectations. Since the 1960s in the United States, inversion has preceded every recession, at lags that have run from roughly six months to two years, with at least one signal that did not produce one. A lag that variable is a warning, not a trade.
The curve typically re-steepens before the recession begins, as the market prices in the cuts it expects. That means an investor who waits for the disinversion has a later signal but a much less noisy one, which is why the shape of the disinversion gets more attention than the inversion itself: bull steepening from the front end, rather than bear steepening from the long end.
What candidates get wrong
- Treating inversion as a timing signal. The historical lead time is measured in quarters and has varied by a factor of four.
- Saying "the curve steepened" without saying which end moved. A bull steepener and a bear steepener carry opposite messages.
- Ignoring the term premium. A long yield can rise with no change whatever in expected policy, simply because investors demand more for holding duration.
- Comparing curves across issuers of different credit quality. A curve is a statement about time for one issuer; mixing issuers adds credit risk to the picture and it stops meaning what you think.
Yield Curve: frequently asked questions
What does an inverted yield curve mean?
That short-dated yields are above long-dated ones, which happens when the market expects the central bank to cut rates. Since expectations of cuts usually reflect expectations of a weakening economy, inversion is read as a growth warning. In the United States it has preceded every recession since the 1960s, but at lead times ranging from roughly six months to two years, so it says something about direction and very little about timing.
What is the difference between a bull steepener and a bear steepener?
Both describe the curve getting steeper, but for opposite reasons. A bull steepener is short yields falling faster than long yields, typically because the market has brought forward expected rate cuts, so bonds rally and the front end rallies most. A bear steepener is long yields rising faster than short ones, typically a repricing of growth, inflation or term premium. Saying only "the curve steepened" leaves out the half that carries the meaning.
Why is the long end of the curve harder to interpret?
Because it contains two things that cannot be separated by observation. A 10-year yield is roughly the average expected short rate over ten years plus a term premium for bearing duration risk. The term premium is not directly observable; it is estimated by models that produce materially different answers. So a 40bp rise in the 10-year may be a change in expected policy, a change in the compensation demanded for duration, or both, and which one it is changes what it means.
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