US diesel crack spread hits record $102 for the first time on supply disruptions.

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It means diesel is trading about $102/barrel above WTI crude, before accounting for actual refinery operating costs, transportation, etc. It is commonly used as a rough gauge of refining profitability and, more importantly right now, of how scarce diesel is relative to crude. ICE describes crack contracts similarly as the spread between refined-product futures and crude futures.

Why it matters: this is signaling that the bottleneck is increasingly refined fuel, not crude oil itself. Middle Eastern exports have been disrupted, Russia has halted international diesel sales after refinery attacks, global refinery throughput has fallen, and U.S. distillate inventories were recently at their lowest seasonal level since 1996. Even though U.S. refiners are producing aggressively, strong exports are pulling barrels out of domestic inventories.

For the economy, that can be nasty. Diesel powers trucks, trains, farm machinery, construction equipment and parts of manufacturing, so sustained high diesel prices can filter into freight costs ? food and goods prices ? inflation. Farmers are especially exposed right now because Northern Hemisphere harvest demand is high.

For markets, refiners are the obvious beneficiaries because each barrel of crude they can turn into diesel is unusually valuable. But there is an important catch: refinery capacity is limited, so a huge margin doesn't instantly create more diesel. Reuters quoted one trader making essentially that point: with the crack above $100 despite rising U.S. production, the constraint has become available refining capacity and replacement supply globally.

So the shortest interpretation is: $102 diesel crack = a flashing red warning that the world is very short refined diesel, even if it isn't necessarily short crude oil. If it persists, I'd watch trucking/freight rates, food inflation, refinery stocks, and broader inflation expectations.

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