President Donald Trump's threats to impose high tariffs on countries make U.S. trading partners and investors nervous. But his sector tariffs could hurt consumers and businesses more in the long run.

It was another day of reacting to Donald Trump’s latest remarks. The president sowed chaos in metals markets by indicating the US would implement a higher-than-expected 50% tariff on copper imports, spurring a record spike in New York futures and a drop in the global benchmark.