SANTIAGO, August 15 — Copper traders are pricing in a one-in-three chance that the US will slap a 30% tariff on refined copper imports by January 2028, a risk assessment that has caught the attention of Chile, the world’s dominant producer of the metal. The signal comes not from Washington but from the market itself. Societe Generale, in a note published on 10 August, pointed to the widening premium of New York copper prices over London prices as evidence that traders are hedging against the possibility of future US duties.
The technical reality, as ever, is in the spread.
The mechanics of the market
Copper, as a globally traded commodity, moves on two primary exchanges: the London Metal Exchange and the Comex in New York. Under normal conditions, the prices on both markets track each other closely, adjusted for local logistics and currency effects. But when the New York price climbs significantly above London’s, it often reflects expectations of higher costs to deliver metal into the US—such as a tariff.
Societe Generale’s analysis hinges on this divergence. The bank’s economists argue that the current premium implies a 37% probability that a 30% tariff will be imposed on refined copper imports within the next 18 months.
The tariff itself remains speculative—no legislation has been introduced, let alone passed—but the market’s reaction is real.
Chile’s exposure
For Chile, the stakes are high. The country is the world’s largest producer of copper, a metal that has long been the backbone of its export economy. A 30% tariff on refined copper entering the US would not only squeeze margins for Chilean producers but could also disrupt established supply chains.
The US is a major consumer of the metal, and any barrier to trade would force a reconfiguration of flows, costs, and contracts. The detail that matters here is that the risk is being priced in now, well before any policy decision.
This is not a political forecast but a financial one, derived from the behaviour of traders who have skin in the game. The premium does not tell us whether the tariff will happen—only that the market is assigning it a non-trivial probability.
What to watch next
In the coming months, the spread between New York and London prices will be the canary in the coal mine. If it widens further, the implied probability of a tariff will rise. Conversely, any narrowing would suggest traders are growing less concerned.
For Chile, the focus will be on Washington’s next moves—whether the US administration signals an appetite for such a measure or whether the idea fades under scrutiny. As ever, the technical reality will outpace the headlines.
The market has spoken, for now. The question is whether policymakers will listen.
Sources
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