Commodity Markets Structure and Fundamentals

What makes a barrel of oil, a bushel of wheat, and a megawatt-hour of electricity part of the same family? They are all commodities — basic goods that can be bought and sold in standard ways. This chapter opens the door to commodity markets: who trades them, what contracts they use, and the unusual price patterns that appear, especially when storage is impossible — as it is for electricity.

The Big Picture#

Commodity markets are not like stock markets. The goods are physical, so storage and transport matter enormously. Prices are shaped by inventories, weather, and production patterns. If you understand the core contracts — spot, forward, and futures — and how market players behave, you can see why futures curves slope up or down, why some commodities follow seasonal cycles, and why electricity, which cannot be stored, is in a league of its own. This chapter gives you the mental tools to make sense of these fascinating markets.

Spot, Forward, and Futures Contracts#

Before we talk about prices and strategies, we need to understand the basic trading agreements that move commodities from producers to consumers.

The spot price is the cash price for immediate delivery of a commodity. If you walk into a fuel depot and buy a barrel of oil today, you pay the spot price. Spot markets are physical; you must be able to take delivery (or arrange it) right now.

Spot price: The current price for immediate physical delivery of a commodity.

Most real-world commerce does not happen on the spot. A farmer planting wheat today wants to lock in a selling price for the harvest months from now. An airline wants to know what its jet fuel will cost next summer. This is where forward contracts come in.

A forward contract is a private agreement between two parties to buy or sell a specific quantity of a commodity at a fixed price on a future date. Everything is customised: the quality, the delivery location, the quantity, and the settlement date. Forwards are traded over the counter (OTC) — directly between two firms, often with a bank or trading house in the middle. Because they are tailor-made, forwards are flexible but carry counterparty risk: if the other side goes bankrupt, your deal could be worthless.

Forward contract: A customised, OTC agreement to buy or sell an asset at a fixed price on a future date.

Futures contracts solve the customisation problem by making everything except the price standard. A futures contract is traded on a regulated exchange (like the CME or ICE), and it spells out exactly the quantity, quality, delivery month, and delivery point of the commodity. For example, a WTI crude oil futures contract on the CME calls for 1,000 barrels of light sweet crude delivered at Cushing, Oklahoma. Because the terms are fixed, futures can be bought and sold easily — they are highly liquid.

Futures contract: A standardised, exchange-traded agreement to buy or sell a fixed quantity and quality of a commodity at a specified future delivery date.

Futures prices are discovered through open, competitive bidding. The exchange clearing house becomes the buyer to every seller and the seller to every buyer, which nearly wipes out default risk. The trade-off is that you must post margin (a performance bond) and settle gains and losses daily through a process called marking-to-market.

To keep our language straight, when the delivery date of a forward or futures contract arrives, the buyer takes physical delivery of the commodity — unless the contract is cash-settled. In that case, the difference between the contract price and the spot price is simply paid in cash. Many energy and financial commodity contracts are cash-settled to avoid the headaches of physical delivery.

📝 Section Recap: Spot prices are for immediate delivery; forward contracts are customised OTC deals; futures contracts are standardised, exchange-traded instruments that make price discovery and risk transfer efficient.

Who Trades and Why: Market Participants#

Commodity markets exist because different groups have different needs. We can group the main players into three camps.

Hedgers are commercial participants who produce or consume the physical commodity. A wheat farmer is a natural long hedger — they will own wheat in the future and sell futures to lock in a price, protecting against falling prices. A cereal manufacturer is a natural short hedger — they need to buy wheat, so they buy futures to protect against rising prices. Their main goal is to reduce unwanted price risk, not to guess where prices are headed.

Speculators (or traders) do not handle the physical commodity. They buy and sell futures purely to profit from price changes. A speculator who believes oil prices will rise buys futures; one who thinks prices will fall sells futures short. Speculators bring liquidity and absorb the risk that hedgers want to shed. Without them, futures markets would be shallow and expensive to trade.

Arbitrageurs look for mispriced relationships. If a futures contract is too expensive relative to the spot price, an arbitrageur might buy the physical commodity, store it, and simultaneously sell the futures contract, locking in a risk-free profit. This activity enforces the cost-of-carry relationship and keeps prices in line.

Hedger: A commercial participant who uses derivatives to reduce an existing price exposure. Speculator: A trader who takes on price risk in the hope of profiting from price movements, with no underlying physical interest. Arbitrageur: A trader who exploits price discrepancies between related instruments to earn a risk-free profit.

📝 Section Recap: Hedgers use the market to shed risk, speculators absorb that risk for a potential profit, and arbitrageurs keep pricing relationships honest.

The Theory of Storage and Convenience Yield#

For commodities that can be stored — crude oil, copper, natural gas in tanks, grain in silos — inventory plays a starring role in shaping futures prices.

Imagine you are a copper refiner. If you hold a ton of copper in a warehouse, you can sell it today at the spot price, or you can hold it and sell it later via a futures contract. Holding inventory has costs: you pay for warehouse rent, insurance, and the interest expense on the money tied up in the metal. These are the carrying costs.

The cost-of-carry relationship ties the futures price to the spot price and the carrying costs. If all costs are continuous and proportional, we can write:

Here is the risk-free interest rate (the cost of tying up capital), is the continuous storage cost rate (warehouse, insurance), is the convenience yield (a benefit of holding the physical good), and is the time to delivery. We will unpack the pieces one by one.

If you simply store copper with no special benefits, the futures price should exceed the spot price by enough to pay for interest and storage: . This is called full carry or full cost-of-carry. A market where naturally from these costs is in contango (we will get to that soon).

But what if holding physical copper gives you an extra advantage that a futures contract cannot provide? For example, a copper fabricator might need immediate access to metal to avoid factory stoppages when supply is tight. The benefit of having physical inventory on hand, beyond any cash flow from later sale, is the convenience yield.

Convenience yield: The implicit benefit that goes to the holder of a physical commodity from having immediate availability. It often appears when inventories are low and the good is in high demand.

When inventories are scarce, convenience yield can be large — even larger than the sum of interest and storage costs. Then the futures price falls below the current spot price: . This flip is not a violation of no-arbitrage; it simply means that holding the physical asset is so valuable today that a promise of future delivery is worth less.

We cannot see the convenience yield directly; we figure it out from the spot and futures prices. For a given futures price, the implied convenience yield is . So low inventories push up and depress relative to .

📝 Section Recap: The cost-of-carry model shows that futures prices reflect interest and storage costs minus a convenience yield; low inventories boost the convenience yield, sometimes making futures cheaper than spot.

Contango, Backwardation, and the Term Structure of Inventories#

Plot the futures prices for different delivery months on a vertical axis and you get a curve called the forward curve or term structure. The shape of this curve tells you a lot about the state of the commodity’s inventories.

When nearby futures prices are lower than prices for later delivery (the curve slopes upward), the market is in contango. This is the normal state for storable commodities with plenty of supply. Carrying costs push deferred prices higher. For example, if spot gold is 2,100, the market is in contango.

When nearby futures prices are higher than prices for later delivery (the curve slopes downward), the market is in backwardation. This happens when current supply is tight, inventories are low, and the convenience yield is high. Buyers are willing to pay a premium to get the commodity now rather than wait, bidding up spot and nearby futures prices. The futures curve slopes downward. For instance, if front-month crude oil trades at 80, the market is in backwardation.

Contango: A term structure where futures prices rise with maturity; and the curve slopes upward. Backwardation: A term structure where futures prices fall with maturity; and the curve slopes downward.

Inventory levels are the hidden hand behind the curve. When warehouses are full, there is no stress — storage is cheap and convenience yield is near zero, so the market sits in contango. When stocks are drawn down to dangerously low levels, fear of a physical shortage drives up spot and nearby prices, creating backwardation. This connection is sometimes called the term structure of inventories.

So far we have described the actual futures price relative to today’s spot. There is another idea, originally from John Maynard Keynes, that concerns the relationship between the futures price and the expected future spot price. If hedgers are mainly producers (farmers, miners) who sell futures to protect against falling prices, they must attract speculators to take the other side of the trade. To get speculators to bear price risk, the futures price must be set below the expected future spot price, so that speculators on average earn a positive return. Keynes called this normal backwardation.

Normal backwardation: A situation where the futures price is regularly lower than the expected future spot price, giving an expected risk premium to long speculators.

If, instead, the dominant hedgers are consumers (airlines, food processors) who buy futures, the hedging pressure is on the buy side. Then the futures price may be bid above the expected future spot price — normal contango — and short speculators earn the premium. The theory of hedging pressure simply says that net hedging demand determines whether the risk premium is positive or negative for long futures positions, pulling the futures price away from being an unbiased predictor.

In short, the shape of the futures curve (contango or backwardation) is driven by the cost of storage and the convenience yield from physical inventory; the bias of the futures price relative to expected spot (normal backwardation or contango) is driven by hedging patterns and the compensation speculators require.

📝 Section Recap: Contango arises when carrying costs dominate; backwardation when scarcity drives convenience yield high. Normal backwardation and hedging pressure explain why futures may hold a risk premium that moves them away from expected spot prices.

Electricity: The Non-Storable Commodity#

Electricity is unlike any other commodity in one basic way: you cannot store it in meaningful amounts. (Batteries and pumped-hydro storage do exist, but they are still tiny relative to total generation.) This single fact turns the rules of storage and convenience yield upside down and gives electricity its wild price behaviour.

Because electricity cannot be stored, supply must equal demand at every instant. If a large power plant trips offline or a heatwave sends air conditioners roaring, there is no pile of “stored electricity” to draw upon. The spot price can spike from to per megawatt-hour () in minutes — and fall back just as fast once the imbalance is corrected. This extreme unpredictability is a defining feature.

Load-driven periodicity makes electricity prices fairly predictable in their seasonal and daily patterns, even though they are hard to forecast hour by hour. In most regions, electricity demand follows a strong daily cycle: low at night, rising through the morning, peaking in the late afternoon or early evening, and then falling. Summer cooling loads and winter heating loads add yearly seasonality. The classic “load curve” shows a repeated hump each day. Modern grids with a lot of solar power see a “duck curve” — a deep midday dip in net load when solar floods the system, followed by a steep ramp-up as the sun sets. All these patterns create regular cycles in the day-ahead and real-time power prices.

Another critical feature is inelastic demand. In the short run, most consumers and businesses cannot easily adjust their electricity use when prices change. If the price doubles, we do not turn off the lights. This means that even a small shortage of supply can trigger a huge price spike, because demand does not step aside. The flip side is that a small oversupply can drive prices to zero or even negative (generators may pay to keep producing rather than incur the cost of shutting down and restarting).

Inelastic demand: Demand that changes very little when the price changes — a short-run feature of most electricity consumption.

Electricity cannot be transported without cost — transmission lines have thermal limits, so prices in one region can be completely separate from those in another if the lines are congested. Regional spot prices then reflect local generation and load conditions.

Even though storage is impossible, market players can still trade electricity futures and forwards. These contracts are cash-settled against the average spot price over a delivery period (for example, a month’s worth of hourly spot prices). They let generators lock in a price for their output and let large consumers stabilise their costs, even though the underlying good cannot be warehoused. The futures curve for electricity shows a different kind of structure — it is driven mainly by seasonal patterns, concerns about resource adequacy (will there be enough generation capacity this winter?), and expectations about fuel input prices (natural gas, coal), rather than by storage costs and convenience yield. The curve often shows strong yearly cycles and can flip between contango and backwardation as fuel and demand expectations shift.

📝 Section Recap: Because electricity cannot be stored, its spot price is extraordinarily jumpy, shaped by instant supply-demand balance, daily and seasonal load patterns, and inelastic demand. Futures contracts provide the essential price-hedging tool even without physical inventory.

Managing Risk: The Role of Derivatives#

The contracts we have described — forwards, futures, and also swaps and options — are the lifeblood of commodity risk management. At their core, derivatives are contracts whose value depends on (derives from) an underlying asset, such as the spot price of crude oil or the average power price in a given month.

For a wheat farmer, selling wheat futures turns an uncertain future revenue into a known one. For a utility that burns natural gas, buying gas futures locks in a fuel cost, letting the utility offer fixed-price electricity contracts to its customers without gambling on volatile gas markets. This is plain hedging: trading price risk for certainty.

Speculators step in to carry the risk that hedgers shed. If every corn farmer in the Midwest wanted to sell futures at the same time and there were no speculative buyers, futures prices would be driven artificially low. Speculators stand ready to buy, expecting that prices will rise later. They watch weather, inventories, shipping data, and global demand to form a view. In the process, they help push prices toward informed fair values.

Arbitrageurs tie the pieces together. If a commodity’s futures price strays too far from the cost-of-carry model, arbitrageurs will buy the physical good and store it while selling the overpriced futures. This trading quickly pushes prices back into line, making the market more efficient for everyone.

Derivatives also let market participants trade spreads — price differences between related contracts. A refiner buys crude oil and sells gasoline and heating oil; it has a natural exposure to the crack spread (the difference between product prices and crude cost). By using futures on crude and products, the refiner can lock in that margin. Similarly, power generators can trade the spark spread (the difference between the power price and the cost of natural gas used to generate it), using futures on electricity and natural gas to protect profitability.

The heartbeat of commodity derivatives is liquidity — the ability to enter and exit positions quickly at stable prices. Futures trading on organised exchanges provides transparency, standardisation, and the safety of central clearing. This infrastructure is what allows a farmer in Brazil to hedge a crop price, a European airline to manage jet fuel cost, and a Japanese power company to secure LNG supplies, all in a deeply connected global market.

📝 Section Recap: Derivatives let producers and consumers swap price uncertainty for manageable fixed costs. Speculators absorb the transferred risk, and arbitrageurs keep fair price relationships across markets and time.

Summary#

Commodity markets combine physical goods with financial tools. Spot prices reflect immediate delivery; forward contracts are customised deals; futures are standardised exchange-traded contracts. Hedgers shed risk, speculators take it on, and arbitrageurs keep prices fair. For storable commodities, storage costs and convenience yield shape the forward curve — contango when supply is ample, backwardation when inventories are tight. Hedging pressure can also nudge futures prices above or below the expected future spot. Electricity, which cannot be stored, breaks those patterns, showing extreme price spikes and daily cycles. Derivatives tie everything together, letting risk be priced, moved, and managed.