What Drives Commodity Futures Prices

An investor who buys a commodity fund expecting it to track the spot price of oil, gold, or corn is often surprised when the two diverge meaningfully over time. The gap comes from storage cost and convenience yield, two forces that do not exist in stock or bond futures pricing but dominate commodity futures pricing.

By Karanvir Singh, founder of Quantix Invest

The core mechanism: carry cost plus convenience yield

Commodity futures follow the same cost-of-carry logic as financial futures, with one important addition. A financial asset like a stock index costs essentially nothing to store and often pays income along the way in the form of dividends. A physical commodity costs real money to store, insure, and sometimes transport, and holding the physical good right now can carry its own practical benefit, called a convenience yield, distinct from any income payment: the value of having barrels of oil on hand to keep a refinery running, or bushels of wheat on hand to keep a mill operating, without having to wait for a future delivery date.

The full relationship is F_0 = S_0 × (1 + r_f + storage cost - convenience yield) over the relevant period. When storage and financing costs dominate, the futures price sits above the spot price, a market condition called contango. When convenience yield, driven by tight near-term supply, dominates instead, the futures price can sit below the spot price, a condition called backwardation, the mirror image of the usual case and a signal that the physical market is under stress right now in a way the futures market, pricing delivery months from now, is not.

Convenience yield is not a single, universal number across commodities; it depends heavily on how a specific commodity is used and stored. An industrial input consumed continuously in production, such as crude oil feeding a refinery or copper feeding a manufacturing line, tends to show larger, more volatile convenience yield swings tied directly to the operational risk of running short, while a commodity held primarily as a store of value, such as gold, shows a comparatively small and stable convenience yield, since almost nobody needs physical gold on hand for an ongoing production process the way a refiner needs crude oil. This distinction is why gold's futures curve behaves far more predictably, and far closer to pure cost-of-carry pricing, than the futures curve of an actively consumed industrial or energy commodity.

The math: a backwardated market under supply stress

Take crude oil trading at a spot price of $75 per barrel, with a risk-free financing rate of 5%, storage costs of 2% annually, and, because near-term supply is unusually tight, a convenience yield of 9% annually, reflecting how badly refiners want oil in hand right now rather than a promise of delivery in a year. For a one-year contract: F_0 = 75 × (1 + 0.05 + 0.02 - 0.09) = 75 × (1 - 0.02) = 75 × 0.98 = $73.50.

The futures price, $73.50, sits $1.50 below today's spot price of $75, even though the ordinary carrying costs of financing and storage, 7% combined, would on their own push the futures price higher. The convenience yield of 9% more than offsets those carrying costs, producing genuine backwardation. This is not a forecast that oil prices are about to fall; it is a direct readout of how much more valuable a barrel in hand is, right now, than a barrel promised for delivery a year from now, given the current supply situation.

A second example: a contango market with ample supply

Now consider corn shortly after a large harvest, when supply is abundant and grain elevators are full. Spot corn trades at $4.50 per bushel, with a financing rate of 5%, storage and insurance costs of 4% annually, reflecting the real cost of keeping grain dry and secure in an elevator, and a convenience yield of just 1%, since ample nearby supply means holding physical corn right now provides little practical advantage over a futures contract for later delivery. For a contract six months out, T = 0.5: F_0 = 4.50 × (1 + (0.05 + 0.04 - 0.01) × 0.5) = 4.50 × (1 + 0.08 × 0.5) = 4.50 × (1 + 0.04) = 4.50 × 1.04 = $4.68.

The futures price sits $0.18 above spot, a roughly 4% gap over six months, or about 8% annualized, closely tracking the 8 percentage point combined carrying cost less the small convenience yield. This is ordinary, well-behaved contango, exactly what standard cost-of-carry pricing predicts for a commodity in ample supply, and it tends to reappear predictably in agricultural futures curves each year around harvest season as new supply enters storage and near-term scarcity, and the convenience yield that comes with it, temporarily disappears.

What the evidence shows about roll yield and term structure

An investor holding a commodity futures position, rather than the physical commodity, earns a return with three separate pieces: the change in the spot price itself, interest earned on the collateral typically posted against a futures position, and roll yield, the gain or loss from periodically selling an expiring futures contract and buying a longer-dated one to maintain exposure. Research on commodity futures returns over long historical windows has found that roll yield, driven by whether a market sits in backwardation or contango, has historically been a meaningful, sometimes dominant, contributor to total commodity futures returns, occasionally larger in magnitude than the spot price change itself over multi-year periods.

A structural shift often described as the financialization of commodities, a sustained wave of index-based and exchange-traded fund investment flowing into commodity futures markets beginning in the early 2000s, has been studied for its effect on term structure and roll yield across various commodities, with evidence suggesting these flows compressed backwardation in some markets by adding persistent long-only buying pressure at the front of the futures curve that had not existed at comparable scale before. The effect has varied meaningfully by commodity and by period, underscoring that no single, universal pattern describes commodity futures term structure across all goods and all times.

Seasonality is a second well-documented feature of commodity term structure, particularly for agricultural goods with a single annual harvest. Grain futures curves have historically shown a recurring pattern of relative scarcity, and elevated convenience yield, in the months immediately before a new harvest arrives, followed by a shift toward ample supply and lower convenience yield once the harvest is in and storage bins are full. Natural gas shows an analogous, though differently timed, seasonal pattern tied to heating demand in winter months, with futures curves regularly showing higher near-term prices heading into the coldest months of the year and lower prices for contracts covering the milder shoulder seasons. These patterns are not guarantees, since weather and demand shocks can override the typical seasonal shape in any given year, but they are persistent enough to show up reliably across long historical records.

Applying this to a real portfolio

The practical consequence for anyone holding a commodity exchange-traded fund is significant and frequently underappreciated: most broad commodity funds hold futures contracts, not the physical commodity itself, and must roll those contracts forward as they approach expiration. In a persistently contango market, that roll requires selling a cheaper, expiring contract and buying a more expensive, longer-dated one, a mechanical drag on returns that can cause a fund to underperform the change in the spot commodity price by a meaningful margin over a multi-year holding period, even when the spot price itself has been flat or modestly higher. This dynamic has been widely documented in energy-focused commodity funds during extended periods of contango, where realized fund returns lagged spot price changes by a wide margin.

Gold is a partial exception worth knowing: physically backed gold funds hold actual bullion in vaults rather than rolling futures contracts, so they largely avoid roll yield drag and track the spot price of gold closely, aside from a small annual expense ratio, which is one reason gold exposure behaves differently in a portfolio than an oil or broad commodity index fund built on futures. An investor evaluating "real assets" exposure for inflation protection or diversification should check, for each specific fund, whether it holds physical inventory or rolling futures, since the return experience of the two structures can diverge substantially even when tracking the same underlying commodity.

Broad, diversified commodity index funds spread this roll-yield exposure across a basket of energy, metals, and agricultural futures rather than concentrating it in a single commodity, which smooths out some of the commodity-specific term structure risk but does not eliminate it, since the underlying index still rolls futures contracts on a defined schedule regardless of whether each individual commodity happens to be in backwardation or contango at the time. An investor comparing two commodity funds tracking similar underlying baskets should check the specific roll methodology each fund uses, since some strategies attempt to reduce roll-yield drag by selecting contracts further out on the curve or by weighting toward commodities currently in backwardation, an approach that has shown mixed but generally favorable historical results relative to naive, front-month-only rolling.

Actionable breakdown

• Separate the components of a commodity futures price.
  • Financing and storage cost push the futures price above spot.
  • Convenience yield, driven by scarcity, pulls it back down.
• Read backwardation and contango as physical market signals.
  • Backwardation often signals near-term supply tightness.
  • Contango often signals ample near-term supply.
• Check how a commodity fund actually gains its exposure.
  • Futures-based funds are exposed to roll yield gains or drag.
  • Physically backed funds like most gold funds largely avoid it.
• Match holding period and structure to the commodity's typical curve.
  • Persistent contango commodities are costlier to hold long term via futures.
  • Seasonal patterns recur predictably in agricultural commodities.

Common pitfalls

The most common pitfall is buying and holding a futures-based commodity exchange-traded fund for years expecting it to simply track the spot commodity price, without accounting for how persistent contango can quietly erode returns even while the spot price itself is flat or rising modestly.

A second pitfall is assuming all commodities behave alike. Storable, widely produced metals typically show more stable, predictable term structures than perishable agricultural goods or commodities with limited storage capacity, such as natural gas during peak demand season, where convenience yield can spike sharply and unpredictably.

A third pitfall is treating convenience yield as directly observable, when it is actually inferred from the gap between the futures price and the spot price after backing out financing and storage costs, adding a layer of estimation uncertainty to any attempt to forecast where a commodity's futures curve is headed next.

A fourth pitfall is ignoring roll methodology when comparing two commodity funds that appear similar on the surface. Two funds tracking the same broad commodity basket can deliver meaningfully different net returns over several years purely because of differences in which contracts they roll into and on what schedule, a detail buried in fund prospectuses that rarely receives the attention it deserves relative to headline expense ratios.

The bottom line

Commodity futures pricing adds storage cost and convenience yield on top of ordinary financing cost, and that addition, not a forecast of future prices, is what determines whether a commodity fund's returns track, lag, or lead the spot price of the commodity it holds.

Related reading: gold and commodities guide, futures prices versus expected spot prices, how futures prices are determined, the futures contract, futures market strategies.

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