How commodity prices change a manufacturer’s input bill, a producer’s receipts and a processor’s margin, and what a matching hedge must offset.
Commodity price risk
Commodity price risk is the exposure of input costs, sales proceeds or position values to changes in commodity prices. A manufacturer that must buy an input at a future market price can lose margin when that price rises, even if it never trades a commodity derivative. A producer with unsold output can suffer when the selling price falls.
The same price move can therefore hurt a buyer and help a seller. Measuring the risk starts with the business's actual purchase and sales commitments, rather than a view on whether “commodities” will rise.
A purchase bill with a moving price
Suppose a fictional manufacturer must buy 1,000 barrels of an input on a specified future date. Its budget uses USD 80 per barrel, but the purchase price will be the market price on that date. The quantity is fixed; all scenarios refer to the same grade, location and delivery terms. Ignore taxes, delivery charges and hedges.
If Q is the number of barrels and S the purchase price in USD per barrel, the input bill is
C=QS.
Purchase-price scenario
Price, USD per barrel
Input bill, USD
Change from budget bill, USD
Lower price
60
60,000
−20,000
Budget reference
80
80,000
0
Higher price
100
100,000
+20,000
The move from USD 80 to USD 100 raises the bill by USD 20,000, or 25%. With quantity held fixed, the exact cost change is
ΔC=QΔS=1,000(100−80)=USD 20,000.
Each USD 1 per barrel price increase adds USD 1,000 to this purchase bill. The three prices are stipulated scenarios, with no assigned probabilities; they are neither forecasts nor estimates of a maximum loss.
For a fixed purchase of 1,000 barrels, prices of USD 60, 80 and 100 per barrel produce input bills of USD 60,000, 80,000 and 100,000. Moving from the budget price of 80 to 100 adds USD 20,000, or 25%, to the bill.
Fixed physical requirement, uncertain cash cost. Original synthetic scenarios for one future purchase date; USD prices and bills, excluding hedges, taxes and delivery charges.
The extra bill reduces operating profit by the same amount only if output revenue and all other costs stay unchanged. If the manufacturer can raise selling prices or substitute another input, its net profit exposure changes. The bill increase alone is not a mark-to-market trading loss.
Identify which side of the price is exposed
A useful exposure map separates commitments that are already fixed in price from those that will be priced later.
Physical exposure
Adverse price move
Usual offsetting futures direction, subject to matching
Future input purchase at a floating price
Input price rises
Long the input futures
Future output sale at a floating price
Output price falls
Short the output futures
Future input purchase and output sale, both unpriced
Input cost rises relative to output revenue
Long input futures and short output futures, in appropriate quantities
For the final row, a processor's margin depends on both prices. The relevant risk can be the change in their difference, rather than either price in isolation. CME's crack-spread explanation illustrates this for a refiner buying crude and selling refined products. Actual input/output quantities and conversion yields matter.
A producer's unsold inventory may benefit from a price rise while its future input purchases become more expensive. Combining those exposures requires their quantities, pricing dates and contract terms. A fixed-price sales agreement can remove one selling-price uncertainty while leaving production costs and the ability to deliver exposed.
A hedge must match the price that matters
A futures contract can offset a specified commodity-price exposure: a long position gains when its futures price rises, while a short position gains when it falls. The LME's hedging guide explains how physical transactions can be paired with opposing financial exposures. Successful matching depends on the physical pricing arrangement.
A benchmark crude contract does not automatically hedge every barrel of fuel. Differences in grade, location, purchase date or pricing window can make the actual purchase price and hedge price move differently. The resulting basis risk survives even if the hedge has the intended direction. Uncertain purchase or production volume can also turn a previously suitable hedge into an oversized position.
Hedging changes cash-flow timing too. A futures position can require margin cash before the physical transaction produces the offsetting benefit, creating funding liquidity risk. Physical availability is another question: a financial gain does not itself deliver the input needed to keep a plant running.
The Commodities primer develops physical contract specifications, storage, forward-curve shape and a producer hedge. Its preview is public, and the full lesson is available with a signed-in free account.
For a risk report, specify the commodity and delivery terms, the quantity and pricing date, which receipts or payments move with price, and which costs or revenues are held fixed in each scenario. Then assess the combined physical and hedge cash flows. A headline commodity-price percentage is insufficient to describe a firm's exposure.
Sources
John C. Hull, Options, Futures, and Other Derivatives, ninth Global Edition, Pearson, 2018, Chapter 3: “Basic Principles,” “Short Hedges” and “Long Hedges,” printed pages 71–73; “Basis Risk,” printed pages 76–78. Grounds the buyer/seller hedge directions and mismatched-price risk; the manufacturer example and figure above are original.
London Metal Exchange — Hedging, checked 26 October 2026. Explains linking physical purchase/sale plans to offsetting financial exposures and the associated margin requirements.
CME Group — Introduction to Crack Spreads, checked 26 October 2026, “What is a Crack Spread?” and “Hedging the Crack Spread.” Explains input/output margin exposure and the long-input, short-output hedge for the stated refining operation.
