Prices of copper in the US have surged since January, when President Donald Trump threatened to impose a tariff on imports of the metal that’s a vital component in power networks, plumbing and industrial machinery.

Prices for the metal hit a record high after the president suggested a higher rate than many analysts were expecting.

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.