What it means
The defining feature of a commodity is fungibility, meaning one unit is functionally identical to another of the same specification. A tonne of a given grade of wheat is a tonne of that wheat regardless of which farm grew it, which is why global markets can set a single reference price.
That interchangeability is also why commodity producers are price takers with very little control over what they receive. Commodities are usually grouped into energy such as oil, gas and power, metals split between industrial metals like copper and precious metals like gold, and agricultural products or softs including grains, livestock, coffee and sugar.
Each group responds to different drivers: energy to geopolitics and production decisions, industrial metals to construction and manufacturing demand, and agriculture to weather and harvest cycles. What they share is that supply cannot respond quickly to a price change, which is why prices swing so violently.
Most commodity trading happens through futures contracts, which are standardised agreements to buy or sell a set quantity at a set price on a future date. Because contracts are standardised and traded on exchanges, a bakery can lock in wheat costs and a mining company can lock in copper revenue without either party ever meeting.
Only a small fraction of contracts result in physical delivery; the rest are closed out before expiry. For an ordinary business, commodities usually matter as an input cost rather than an investment.
A haulier is exposed to diesel, a brewer to barley and aluminium, a construction firm to steel and cement, and each of those exposures can be measured and, if the business chooses, hedged. Ignoring the exposure is itself a decision to accept whatever the market does.
The nuance investors miss is that a commodity is not a productive asset. Shares pay dividends and bonds pay interest, but a barrel of oil sitting in a tank produces nothing and costs money to store, so returns depend on price movement and on the shape of the futures curve rather than on income.
That is why commodities are usually held as a diversifier or inflation hedge rather than as a core long-term holding.
In practice
Real-world examples.
Example
A national bakery chain buys wheat futures covering nine months of expected flour usage, fixing its cost at $260 per tonne. When drought pushes the spot price to $305, its production costs are unaffected and it holds its retail prices while competitors raise theirs.
Example
A copper mining company sells forward 40% of next year's expected output to guarantee a price that covers its cash cost of production. It gives up some upside if copper rallies, but it secures the revenue needed to service the debt on a new shaft.
Example
A pension fund adds a 4% allocation to a diversified commodity index as an inflation hedge. When energy prices surge and its bond holdings fall in value, the commodity sleeve offsets part of the loss, which is the diversification benefit it was bought for.
Think of it
“Commodities are basic raw materials-oil, gold, wheat, etc.
Formula
Calculation
The value of a futures position is: Contract value = Contract size x Price per unit, and the profit or loss on a move is: P&L = (Exit price - Entry price) x Contract size x Number of contracts.
A crude oil futures contract covers 1,000 barrels. With oil priced at $80 per barrel, one contract represents 1,000 x $80 = $80,000 of notional exposure, and five contracts represent $400,000.
Exchanges require only a margin deposit rather than full payment. At an initial margin of 10%, the trader posts $400,000 x 0.10 = $40,000. If the price rises to $84 per barrel, the gain is ($84 - $80) x 1,000 x 5 = $20,000, which is $20,000 / $40,000 = 50% on the margin posted from a price move of just 5%. The same arithmetic runs in reverse: a fall to $76 loses $20,000 and wipes out half the deposit, which is why margin calls in commodity markets arrive quickly.Case study
Seen in the real world.
Here is an illustrative, fictional case. Calder Coach Lines, an invented regional bus operator, burned about 2,400,000 litres of diesel a year and had watched fuel move from 22% to 31% of its operating costs across two turbulent years. Its contracts with local authorities were fixed for three years, so it could not pass any of that increase on.
The finance director built a simple exposure model: every one cent per litre change in diesel moved annual costs by $24,000, so a 20 cent swing was worth $480,000, roughly the company's entire annual profit. Calder hedged 70% of expected volume, or 1,680,000 litres, using fuel swaps priced at $1.40 per litre, leaving 30% floating so it would still benefit if prices fell.
When diesel rose to $1.62 the following year, the hedged portion saved 22 cents x 1,680,000 litres = $369,600, while the unhedged 720,000 litres cost an extra $158,400. The fictional net effect was a $211,200 improvement against being fully exposed, and, more importantly, a cost base predictable enough to bid confidently for the next round of contracts.
Watch out
Common mistakes.
- Confusing hedging with speculating. A hedge offsets an exposure the business already has, whereas taking a futures position without an underlying exposure is a bet, however similar the trades look.
- Assuming commodities are a reliable long-term growth asset. They generate no income, incur storage and rolling costs, and over long periods have often lagged shares badly.
- Judging a hedge by whether it made money. A hedge that loses while input prices fall has done its job perfectly, because the point is predictability rather than profit.
Questions
People also ask.
What is the difference between spot and futures prices?
The spot price is for immediate delivery today, while the futures price is for delivery on a specified future date and reflects storage, financing and expectations.
Do I have to take delivery of the physical commodity?
No, the overwhelming majority of futures positions are closed out before expiry, and financial participants never intend to receive barrels or bushels.
How can a small business manage commodity exposure without a trading desk?
Options include fixed-price supplier contracts, index-linked pricing clauses passed on to customers, and simple bank-arranged swaps, all of which achieve hedging without opening an exchange account.
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