economy
How a niche copper trade became a real-time gauge of Trump’s next tariff move
The widening price of copper between two metals exchanges is offering investors a gauge of U.S. tariff risk.

TL;DR
- The arbitrage trade between U.S. COMEX and London Metal Exchange copper prices has become an indicator of U.S. tariff risk.
- This trade was historically driven by factors like Chinese demand or South American supply disruptions.
- The prospect of new Section 232 tariffs on refined copper has altered the dynamics of this arbitrage.
- Analysts use the COMEX premium over LME prices to gauge perceived tariff risk and potential duty probabilities.
- U.S. policymakers are concerned about reliance on imported refined copper due to increasing demand from AI, grid modernization, and defense spending.
- The Section 232 probe aims to secure access to critical materials for economic growth and national security.
- The current COMEX premium implies a specific probability of proposed tariffs being implemented.
- The Section 232 decision on refined copper is seen as a significant catalyst for the copper market.