By Barnaby "Bottom-Line" Coyne
There's a number traders didn't used to check every morning, and now they can't stop staring at it: the price gap between copper on the London Metal Exchange and copper on New York's Comex.
According to CNBC, that spread has become a real-time gauge of how worried investors are about the next round of tariffs out of Washington. When the gap widens, it's a signal traders think President Trump is closer to slapping new duties on copper imports — pushing buyers to stockpile the metal in the U.S. ahead of time and driving Comex prices further above London's.
It's a strange way to read Washington, but it works because copper touches everything — wiring, plumbing, electric vehicles, data centers. A tariff on it raises costs for builders and manufacturers well beyond the metals desk.
CNBC's reporting doesn't specify a dollar figure for the current spread or a timeline for any tariff decision, and no White House announcement has been confirmed. What's clear is that the market itself is now doing a job usually left to lobbyists and reporters: pricing in a policy nobody has officially made yet.
For anyone with a mortgage on a new-build house or a plant that runs on copper wire, that's not an abstraction. It's a cost that shows up in a bid sheet long before it shows up in a press release.
Somebody's paying for this. Let's find out who.
— Compiled from reporting by CNBC.
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