#TrumpTariffs Announcement by President Trump of a 50-percent tariff on all copper imports has caused a wave of shock in the commodities market, and copper prices on the American COMEX exchange rose immediately after the announcement by as much as 17% (while prices in London (COPPER quotations dependent on this exchange) remain relatively unchanged.

The difference in price behavior is due to local market conditions. On the COMEX, copper prices are rising sharply because American buyers want to secure deliveries before the 50% tariffs are implemented and are mass purchasing contracts. Meanwhile, prices on the LME remain stable because the copper that will not reach the USA increases supply in global markets, which limits the upward pressure on quotations in London.