Inter-market spread

Definition

An inter-market (inter-commodity) spread is long one futures market against short a related but different market — crude vs refined products (the crack spread), soybeans vs meal and oil (the crush), Treasury tenors against each other (curve trades), one equity index vs another. It is pairs trading (strategy-pairs-trading) in futures form, where the “pair” is an economic transformation or substitution relationship.

How it works / structure

• Canonical examples: crack spread (crude → gasoline/ distillate refining margin), soybean crush (beans → meal + oil processing margin), NOB/curve spreads (10-year vs 30-year Treasuries), index vs index (large-cap vs small-cap).
• Ratio construction: legs are sized to economic equivalence (product ratios like 3:2:1 cracks) or risk equivalence (DV01- matched rate legs, vol-matched indexes) — a mis-ratioed spread is an accidental outright (port-exposure-netting).
• Parameters (engine-executable): market pair and ratio, entry level vs the spread’s own history, exit target/stop in spread terms, holding window, margin-credit assumptions (ms-futures-margin).
• Economic anchor: unlike statistical pairs, many inter-market spreads have a physical arbitrage anchor (refinery economics bound the crack long-run) — the anchor bounds long-horizon behavior, not short-horizon pain.

When it applies

Relative theses within a complex (“refining margins recover”, “the curve steepens”, “small caps close the gap”), macro expressions with direction hedged (macro-commodity-linkages, regime-rate-environments), and processing-margin views tied to industry data. Requires both legs liquid and the ratio honest.

Risk profile & failure modes

• Both-legs-against: related is not locked — supply shocks can move one leg alone (a refinery outage moves products, not crude), producing outright-sized losses on a “hedged” position.
• Ratio drift: fixed ratios go stale as economics change; DV01s move with rates; periodic re-ratio is part of the strategy.
• Margin-credit fragility: exchange spread credits shrink or vanish in stress, forcing deleveraging at the wide (ms-futures-margin).
• Complexity masquerading as safety: multi-leg structures feel hedged; realized stress correlations decide whether they are (risk-correlation-exposure).

Evidence & limits

Spread definitions and margin treatment are exchange-documented (CME). There is no general academic literature establishing inter-market spreads as an excess-return class; specific relationships (curve carry, processing margins) have their own partial literatures and are cited where used. Each spread thesis is graded on its own replay; folklore ratios repeated without re-derivation are flagged.

Falsifiable-thesis examples

Illustrations only, not signals:

• “The 3:2:1 crack spread, at C today, will exceed C + Δ within 60 sessions” — falsified by the spread series.
• “The 2s10s Treasury futures curve trade (DV01-matched) will steepen by at least 15bp equivalent this quarter” — falsified by the curve change.

Cross-references

• Statistical cousin: strategy-pairs-trading; same-market version: strategy-futures-calendar-spread
• Macro anchors: macro-commodity-linkages, regime-rate-environments
• Mechanics: ms-futures-margin, ms-contract-specs
• Exposure honesty: port-exposure-netting, risk-correlation-exposure