A specialized copper trading strategy is emerging as an unexpected indicator of potential U.S. tariff decisions. The price difference between American COMEX copper futures and those traded on the London Metal Exchange has shifted from being a simple arbitrage tool into a barometer of tariff expectations, as investors monitor government policy decisions on refined copper imports.
Analysts at Societe Generale have developed a model to interpret these price spreads as probability estimates for future tariffs. According to their analysis, current market conditions suggest roughly a 15% chance of a 15% tariff on refined copper beginning in January 2027, and approximately a 37% probability of a 30% duty by January 2028. These figures reflect Commerce Department recommendations for phased increases in tariffs on refined copper products.
The intensifying focus on copper tariffs reflects broader concerns about American reliance on imported refined copper. Rising demand from artificial intelligence infrastructure projects, electrical grid upgrades, and defense spending has prompted policymakers to evaluate the nation’s supply chain for this critical material. Recent data shows U.S. copper imports reached their highest level in over a decade during July, climbing above 200,000 metric tons as traders anticipate tariff implementation.
Industry specialists note that the pending White House decision on copper tariffs represents the most significant near-term factor affecting copper markets. While elevated tariffs could reshape global copper flows and support domestic prices, analysts warn that continued uncertainty surrounding these policy decisions will likely sustain market volatility in the coming months.
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