Commodity Term Structure

The commodity term structure is the shape of futures prices as they march out in time—how the December contract price compares to the March contract, which compares to the next year. This curve reveals whether the market expects supply tightness or surplus, and whether storage and carry costs are priced in.

Contango: normal backwardation’s inverse

In contango, futures prices rise as you move further out in time. A barrel of crude might trade at $75 spot, $76 for the next month, $77 for the month after, $78 a quarter out, and so on. This is the most common state in commodity markets.

Contango arises because of cost of carry. Storing oil, holding copper, or financing grain in a silo costs money. A merchant who owns physical crude today has to pay interest on the capital tied up and storage fees to keep it. The futures curve embeds those costs: you pay a premium to defer delivery because the seller of the future is compensating for carry expenses.

When contango is steep—often 50 cents per month for oil—the roll cost for a commodity futures position is high. A trader holding a rolling front-month contract will sell it at a loss relative to the next month just to stay exposed, pocketing the difference as the curve unwinds.

Backwardation: when the present is priced higher

In backwardation, nearby months trade at a premium to forward months. Crude might be $75 next month but $73 three months out. This is less common but signals physical scarcity or urgent demand.

Backwardation occurs because holders of the physical commodity have a convenience yield—the value of immediate access to the good. A refinery that can swap its crude for next month’s crude at a discount is, in effect, being paid to hold inventory. This is often visible when supplies are tight: OPEC production cuts, geopolitical disruptions, or seasonal bottlenecks drive crude oil into backwardation because refineries bid up the price of deliverable inventory today.

The steeper the backwardation, the higher the convenience yield—and the more attractive it becomes to own the physical thing rather than betting on forward price changes.

Why the curve shape matters for spreads

Spread traders exploit the term structure. A calendar spread buys the front month and sells the back month (or vice versa), betting that the curve will steepen or flatten. If a market is in steep contango and supply normalizes, the curve often flattens—the back months trade lower, and the spread trade makes money.

In agriculture, commodity curves are especially volatile at harvest and planting seasons. A wheat market might be in backwardation at harvest (supply flush, low convenience yield) but swing into contango by spring as inventory is drawn down and storage costs accumulate.

The connection to convenience yield

The exact level of contango is pinned by the formula:

Forward Price = Spot Price + (Carry Costs) − (Convenience Yield)

Carry costs are easy to measure: storage, insurance, financing. Convenience yield is the hidden ingredient—it captures the intangible value of holding the physical good. When a shortage looms, convenience yield spikes, driving backwardation. When supply is ample, convenience yield collapses to near zero, and the curve is shaped purely by storage costs.

For example, during the 2022 natural gas crisis in Europe, backwardation blew out to extreme levels (December contracts trading 200%+ premium to summer contracts) because heating fuel was desperately needed now. The convenience yield of owning gas in storage was enormous.

Rolling strategies and term structure risk

Investors holding commodity exposure via commodity futures rolling strategies face roll yield: the gain or loss from selling the expiring contract and buying the next month.

• In contango, rolling is expensive: you sell low (current month) and buy high (next month). This drag on returns is often embedded in commodity index funds.
• In backwardation, rolling is profitable: you sell high and buy low, pocketing the spread.

Many commodity ETFs suffer from contango drag year after year. Oil in persistent contango can cost a buy-and-hold investor 2–5% annually just from rolling losses.

Short-term shifts and predictability

The term structure is not fixed. It responds within hours to news—a supply disruption, inventory data, demand shock, or change in interest rates. A market in backwardation can flip to mild contango in a single session once supply normalizes.

Some traders track the shape of the curve obsessively, reasoning that extreme backwardation is unsustainable and will flatten, while very steep contango suggests complacency about carry costs and often precedes a tightening. But the term structure is mostly a reflection of genuine supply–demand balance and carry costs, not a contrarian indicator.