Commodity spot prices and futures are different research objects
An oil price, a futures settlement, and the return of a commodity strategy can move differently without any data error. Each describes a different object. Cross-asset work becomes more useful when the researcher specifies which commodity, location, delivery month, and return convention a comparison actually represents.
Build an instrument identity sheet, compare matching physical and futures observations, and calculate futures profit from the contracts actually held. Treat continuous series as constructed research references, not self-explanatory investments or evidence of executable prices.
Specify the physical benchmark
A spot assessment concerns a commodity with particular quality, location, and delivery conditions. It is not a universal price for every unit of that commodity. Differences between crude grades, transport routes, and processing requirements can matter as much as a broad market move. Begin a research worksheet with units, currency, assessment timing, delivery location, and the underlying source's definition of prompt delivery.
EIA distinguishes spot transactions from futures activity in its explanation of petroleum prices. Use that distinction to ask what an observation measures: an assessed cargo, a transaction-based benchmark, or an exchange settlement. If a chart combines a domestic physical benchmark with an offshore futures contract, describe the mismatch. Calling both lines oil does not remove transport, quality, or timing differences.
Identify the contract rather than only the commodity
CME's contract-specification lesson explains why quantity, quality, delivery location, and maturity belong to a futures contract's identity. Record the exchange, product code, individual expiry, multiplier, quotation convention, and settlement method. Two contracts referencing a similar commodity can still have different sizes or final-settlement procedures. Verify these details in the applicable specification rather than importing assumptions from a familiar neighboring product.
Maturity changes the economic exposure. A near-delivery contract responds to immediate availability and delivery constraints, while a deferred contract incorporates conditions over a different horizon. A study using the nearest contract is therefore not equivalent to one using a fixed six-month maturity. Maintain an explicit mapping from each observation to its contract, especially around expiry and changes in the most actively traded month.
Separate basis from a guaranteed convergence story
Define basis before calculating it; this guide uses futures price minus the matched spot price. Its sign reverses under the opposite convention. Storage, financing, access to the physical good, and delivery constraints can influence the relationship. CME describes contango and backwardation as curve configurations, but a curve's shape is not an unconditional forecast of the future spot price.
Convergence arguments require comparable deliverable goods, location, and settlement terms. A regional spot assessment need not converge to an unrelated benchmark's futures price. Even a correctly matched contract can behave unusually near delivery when storage or transport is constrained. Investigate those mechanisms before declaring an apparent pricing gap an arbitrage, and do not infer that a research user could implement a physical delivery strategy.
Worked hypothetical example: price change versus account capital
Assume a hypothetical futures contract represents 1,000 units and is quoted in dollars per unit. Its settlement rises from 80 to 83 while the matched spot assessment rises from 79 to 82. A long single-contract position has a gross variation gain of USD 3,000. Both price series rise by three dollars, but their percentage changes differ because their starting levels differ.
On USD 100,000 of designated strategy capital, that gain is 3% before collateral income and costs. Dividing by a hypothetical USD 8,000 initial margin instead produces 37.5%, a different denominator and a very different statement about leverage. Basis remains one dollar under the stated convention. These invented settlements demonstrate accounting; they are neither observed trades nor a claim that any participant received those prices.
Choose the series that matches the question
This comparison helps distinguish economic research from investment measurement. A physical benchmark may be appropriate for studying a producer's revenue, while a contract-level ledger is needed to analyze a futures position. A broad commodity index can describe a basket but may conceal substantial differences in weights and maturity selection. Match the data object to the question before downloading the longest available history.
| Data object | Suitable research use | Missing information |
|---|---|---|
| Physical spot benchmark | Prompt supply conditions or input costs | An investor's storage and financing expenses |
| Individual futures contract | Maturity-specific price and profit analysis | A rule for replacing expiring exposure |
| Continuous futures series | Long historical comparison under a documented splice rule | Actual holdings unless separately supplied |
| Collateralized strategy return | Capital-based performance comparison | Transferability to a different implementation |
Audit splicing, settlements, and cash flows
A continuous futures chart requires a roll calendar and a treatment of price gaps. Back-adjusted levels can be useful for some analytical purposes but may not be prices that ever traded. An unadjusted splice can introduce a jump simply because the selected contract changed. Neither construction should be turned into investment returns without understanding the sequence of contracts and the intended accounting method.
CME's mark-to-market explanation makes daily settlements important for futures cash flows. Settlement is nevertheless distinct from a particular order's execution. For a hypothetical strategy, retain the reference convention and identify it as simulated. For an actual account, use transaction and cash records. Check collateral earnings, commissions, bid-ask costs, and the timing of variation payments rather than attributing every difference from spot to roll yield.
Report the comparison with its boundaries
A finished research note should identify both instruments, time conventions, units, and the reason they are being compared. Show basis and individual-contract changes when they clarify a discrepancy. If data exist only as a continuous series, explain which conclusions it supports and which contract-level claims remain unavailable. A useful reference study does not need to masquerade as an execution reconstruction.
Watch for percentage returns calculated across a splice, a margin balance presented as total capital, or a price assessed in one location interpreted as delivery economics elsewhere. These mistakes can reverse a cross-asset ranking while leaving a polished chart. The strongest conclusion may be that two series address different questions, not that one source is wrong or that one instrument offers a superior investment.
What to retain
- Record quality, location, timing, maturity, and contract size before comparing prices.
- Separate futures profit, collateral return, and the capital denominator.
- A continuous price history is a constructed reference, not an execution ledger.
Source notes
Related research
Commodity roll yield without the accounting shortcuts
Understand maturity replacement, curve convergence, collateral income, and the difference between a roll spread and realized strategy profit.
Return definitions that make cross-asset comparisons meaningful
Calculate price, income, currency, real, and futures returns using compatible denominators and compounding conventions.
Reading oil supply and demand through a balanced ledger
Reconcile flows and inventories, distinguish product supplied from end-use consumption, and test alternative explanations for petroleum data.
Version 1, 15 October 2026. First publication. Illustrative calculations are identified in context; source observations retain their stated dates.