What does the shape of the futures curve tell you?
Line up every listed contract month by expiry and you have the forward curve. Its slope has two names, and reading it correctly separates people who understand commodity markets from people who repeat headlines about them.
The two shapes
Contango — later contracts cost more than nearer ones. The curve slopes up. Futures trade above spot.
Backwardation — later contracts cost less. The curve slopes down. Futures trade below spot.
An illustrative crude curve in contango:
- front month $80.00
- +1 month $81.50
- +2 months $82.75
- +6 months $86.00
The same market in backwardation:
- front month $80.00
- +1 month $78.50
- +2 months $77.50
- +6 months $74.00
What each shape is saying
Contango is the default wherever carry is real. Storage and financing have to be paid by whoever holds the physical commodity, so the deferred contract is dearer by roughly that amount. Persistent, steep contango usually accompanies abundant supply and full storage: nobody urgently needs the barrel today, plenty of it is sitting around, and the market is effectively paying you to defer consumption.
Backwardation says the physical good is wanted now. This is convenience yield made visible. A refiner with a plant to run will pay a premium for a barrel today rather than a promise of one in June, because a promise does not keep the unit operating. Backwardated curves appear in tight markets — drawn-down inventories, supply disruption, a buffer that has been consumed. It is a scarcity signal, and one of the more honest ones in markets, because it is paid for in cash by people who need the commodity to do their jobs.
What the curve is not
The forward curve is not a forecast. A six-month crude contract at $86 does not mean the market expects $86 in six months. It mostly means that carrying a barrel for six months costs about $6. Reading the curve as a prediction is the single most common error in commodity commentary, and it generates confident-sounding nonsense at industrial scale.
The equity-index case makes the point cleanly: index futures sit in mild contango whenever financing rates exceed dividend yields, and below the index whenever they do not — through the zero-rate stretches of 2009–2015 and 2020–2021, US index futures traded at a discount for exactly that reason. This says nothing whatsoever about expected equity returns. Same arithmetic, no drama, no message.
The consequence that actually matters
Curve shape is not an academic observation, because anyone holding exposure beyond one contract's life must roll — and the roll converts the shape into realised profit or loss, month after month. Whether long-horizon commodity exposure compounds upward or bleeds away is determined here.
That is the next lesson, and it is the reason this unit exists.
In the data
Curve shape needs several maturities quoted on the same day. The chart below is what a commodity price usually looks like instead: five years of crude oil as one continuous line, the front-month contract rolled forward as each one expires.
Switching it from daily to weekly or monthly changes how often the line is sampled, never which maturity it shows. It can show crude rising all year without revealing whether the curve was in contango or backwardation on a single day of it. The shape is not hidden somewhere in the line — it was never in it.
Try it now
Open a curve where several contract months are quoted together. CME Group publishes the settlement price of every listed month free of charge on each contract's Settlements page; take Crude Oil (CL). Write the front six months in a column and mark the slope: up or down?
Go back to the chart above and switch it to Monthly. Does the slope you wrote down line up with a tight physical market or a well-supplied one?
Describe what you see, do not forecast from it, and be precise about where each half came from: the shape came from the exchange's curve and could never have come from this chart, which has one price per date and no opinion about next June at all.