A commodity is a standardised raw material that can be bought and sold in large, interchangeable units. One unit of a defined grade is treated much like another, which lets the market quote prices and match buyers with sellers efficiently.
Think crude oil, natural gas, gold, copper, wheat, corn, coffee and sugar. These are building blocks of the real economy and they make up a distinct corner of financial markets alongside other asset classes.
What actually counts as a commodity?
In market terms, a commodity is a physical good with three traits. It is broadly fungible, so units are interchangeable at a given specification. It has a standard contract, for example a minimum purity or moisture level. And it is widely produced and consumed, which supports active trading.
People sometimes split commodities into hard and soft categories. Hard commodities are mined or extracted, such as crude oil, natural gas and metals like gold, silver and copper. Soft commodities are grown or raised, such as wheat, corn, soybeans, cocoa, coffee, sugar and livestock. Energy products occupy their own niche because they link directly to power, transport and petrochemicals.
Not every raw input is a commodity in practice. Custom alloys, specialist chemicals or niche timber grades may exist, but if they lack a standard market grade or a deep pool of buyers and sellers, they will not be widely quoted.
How are commodities traded in practice?
Most day to day trading happens through futures contracts on exchanges. A futures contract is an agreement to buy or sell a set quantity of a commodity at a defined quality and delivery point in a given month. Exchanges set the specification, minimum tick size and daily limits. You do not have to pay the full face value up front because futures use margin, a good faith deposit that varies by product and broker.
Futures can be closed out before expiry by taking the opposite side, which is what most financial traders do. Some contracts are physically settled, which means delivery could occur if a position is held to the end. Others are cash settled, so profits and losses are paid in cash and no lorries or tankers change hands. Exact processes differ by exchange and broker.
Outside futures, commodities are traded on the spot market, often between producers, merchants and refiners. There are also options on futures, swaps in the over the counter market and exchange traded funds or notes that aim to track a single commodity or a basket. Details such as fees, tracking method and whether an instrument holds physical stock or futures vary by provider, so always check the structure before you trade.
Benchmarks, grades and delivery points
Because real world goods differ, markets use benchmarks to standardise pricing. Oil is a good example. Brent crude is a North Sea blend that acts as a global reference. West Texas Intermediate is the main US benchmark. Each has a defined quality and delivery arrangement, and other crudes are often priced at a premium or discount to these markers.
The same logic appears in metals and agriculture. COMEX gold contracts specify a minimum fineness and acceptable bar brands. Copper on the LME has a standard purity. Chicago wheat contracts set protein, moisture and test weight. If the actual goods differ from the benchmark grade, the price is adjusted by a differential that reflects quality and location.
Delivery points matter too. A futures price refers to delivery at a named location, such as a particular storage hub or port. Transport costs, local supply and bottlenecks can push regional prices away from the benchmark, which is why you will sometimes hear about basis risk, the gap between a hedge and the physical exposure it is meant to cover.
Why do people and companies use commodity markets?
- Producers hedge to lock in selling prices. A copper miner that sells futures for future months is less exposed to a fall in spot copper.
- Consumers hedge to manage input costs. An airline may use crude oil or jet fuel derivatives to help budget for fuel bills.
- Traders and investors speculate on direction or relative value. They might buy gold on a safe haven view, or trade the spread between two oils.
- Portfolio builders use commodities for diversification. Some see certain commodities as a potential inflation hedge, although results vary by period and product.
Profits or losses from commodity investments may be treated as capital gains or income depending on the instrument and the holder. Rules vary by country and can change. If tax treatment matters for you, read the local guidance on capital gains tax and related regimes.
What drives commodity prices?
Like any market, pricing comes down to supply and demand. For commodities, that often means the balance of production, inventories and consumption, plus expectations for future availability. Weather, harvest yields, mining output, spare capacity, refinery maintenance, shipping constraints and geopolitics can all shift that balance. Because supply can be slow to adjust, even small demand surprises can move prices.
Storage and financing costs are central. If it is cheap and easy to store a commodity, and interest rates are low, holding inventory can make sense. When storage is scarce or costly, the market often prefers prompt supply and penalises holding stock. This dynamic shows up in the futures curve, the series of prices for delivery at different dates.
Two common curve shapes are worth knowing. Contango describes a curve where later deliveries are priced higher than near dates, often linked to storage and financing costs. Backwardation is the opposite, where near dates are more expensive, which can reflect tight immediate supply. If you hold a futures based product, rolling from one contract to the next creates a gain or cost known as roll yield that depends on the curve’s shape.
Seasonality also matters. Natural gas demand can spike in winter heating seasons. Agricultural prices often move around planting and harvest. Even gold has patterns tied to jewellery demand in different regions. None of these effects is guaranteed, but they are closely watched.
A short example of hedging and speculation
Imagine a bakery that expects to buy 200 tonnes of wheat in six months. Today’s cash price suits the budget, but the baker worries that a poor harvest could push prices up. One solution is to buy wheat futures for the relevant delivery month. If wheat rises, gains on the futures help to offset the higher cash outlay. If wheat falls, the bakery pays less for physical wheat but loses on the futures. Either way, budget risk is reduced, at the cost of daily margin swings and potential mismatches between the hedge and the exact flour grade needed.
Now look at a trader who thinks copper demand will improve. They could buy copper futures, accept daily mark to market and plan to roll before expiry. Alternatively, they could use an exchange traded product that tracks copper futures, bearing management fees and potential tracking error. If the curve sits in contango, rolling may erode returns even if spot copper drifts higher. That is the roll yield at work.
Common pitfalls to watch
- Contract specifics vary. One crude oil future might represent 1,000 barrels, another a different amount or grade. Always read the contract spec.
- Physical settlement risk exists if you hold to expiry. Many traders close or roll early to avoid delivery obligations.
- Leverage cuts both ways. Futures margin is a small slice of notional value, so gains and losses are magnified and realised daily.
- Instruments track in different ways. Physically backed funds, futures based funds and notes can behave differently in volatile or contango markets.
Commodities sit at the crossroads of finance and the real economy. They are standardised so that they can be quoted and traded, yet they remain tied to weather, wells, mines and harvests. That mix is what makes the asset class both useful and tricky to handle.