Basis

A futures contract is a deliberately narrow instrument. It names a commodity, a quality specification, a delivery period, and a delivery location or mechanism. Everything outside that specification is excluded from the futures price by design — that exclusion is what makes the contract fungible and therefore tradable. But physical commodities are not fungible: a tonne of wheat in a country elevator far from an export terminal is not the same economic object as a tonne meeting contract specification at the delivery point.

Basis is the residual that reconciles the two. It is the sum of everything the reference price refuses to describe, collapsed into a single figure. This is why basis is best read as a composite rather than as a signal: it is not one thing, and a change in it does not tell you which of its components moved.

Locational component

The cost and availability of moving the physical lot from where it is to where the reference contract is deliverable. Freight, and freight capacity, sit here.

Quality component

The difference between the lot’s measured quality and the contract’s specification, priced through the contract’s discount and premium schedule or through commercial negotiation.

Time component

The gap between when the lot is available and the reference month being quoted, which brings storage and carrying costs into the figure.

Local balance component

Local supply against local demand — elevator space, processor demand, harvest pressure, export programme activity — none of which the reference contract observes.

A basis figure without its accompanying specification cannot be interpreted. Before a quoted basis means anything, a reader needs to know four things: which reference contract it is quoted against, which contract month, what quality is assumed, and at what point in the chain the cash price applies. Change any one and the number changes, without anything in the physical market having moved at all.

• The named reference — a basis against one contract is not comparable with a basis against another, even for the same commodity
• The reference month — rolling a quotation from a nearby month to a deferred one shifts the basis mechanically
• The quality basis — a basis quoted for contract-specification quality is not a basis for a lot that differs from it
• The delivery point and delivery term — farm gate, country elevator, terminal, and free-on-board quotations sit at different points in the chain and carry different costs
• The unit and currency — a basis is a difference between two prices and inherits whatever units and currency those prices carry

In much of the physical grain and oilseed trade, contracts are not written as a flat price at all. They are written as a named reference price plus or minus an agreed basis — a structure that lets the two parties settle the locational and quality question at one time and the outright price question at another. The basis is agreed when the physical lot and its destination are agreed; the reference price is fixed later, by a separate mechanism the contract specifies.

This is a structural fact about how physical contracts are written, not a technique to be applied. It matters for reading market information because it means a great deal of reported commercial activity concerns the basis alone, with the reference price component still open. A report that a lot traded "at a basis of X under the reference" is a statement about the locational and quality gap, and says nothing whatsoever about the outright price the seller will ultimately receive.

Public market reporting reflects this. Reporting services that publish cash market information for physical commodities generally publish it as location-specific quotations or as differentials against a named reference, precisely because a single national price for a physical commodity would conceal the locational structure that basis exists to express.

Basis is well defined only where a reference price exists that the physical market genuinely relates to. Many agricultural commodities have no such reference, and for those the concept simply does not apply — the cash price is the whole of the price, and there is no gap to name.

• Commodities with no established futures or reference contract have no basis, only a price
• Where the physical lot bears little resemblance to the contract specification, the "basis" absorbs so much quality difference that it stops functioning as a locational measure
• Where a reference contract is thinly traded, the reference price itself is a weak anchor and the basis inherits that weakness
• A basis computed against a composite indicator or an index — rather than against a deliverable contract — is a different quantity, because an indicator is not something a lot can be delivered against