Copper prices on the London Metal Exchange and the Shanghai Futures Exchange slipped on Wednesday as the announcement of US copper tariffs signalled an end to a months-long arbitrage trade that had drawn the metal from global markets. US President Donald Trump said on Tuesday he would announce a 50% tariff on copper, sending US Comex copper futures up more than 12% to a record high. US Commerce Secretary Howard Lutnick said shortly afterwards the copper tariffs would likely be in place by the end of July or August 1. “The announcement is like a loud thunder in the middle of the night, very sudden, and a 50% tariff is ... (full story)