Copper futures in New York surged after US President Donald Trump said he planned to implement a 50% tariff on imports, a move that’s likely to spark massive supply-chain ripples through global metal markets.

President Donald Trump said his 50% tariff on copper imports will take effect on Aug. 1, noting he made the decision after a national security assessment.

While the cost of copper is going up for American businesses and consumers, the rest of the world is scratching its head while it enjoys a considerable discount on the price of copper.