It has been a year since President Trump announced double-digit tariffs on imports from around the world. So far, those levies have not produced the economic boom the president promised.

Trump signed an order instituting the levy on Thursday.

The administration announced new levies and made changes to existing tariffs for industries that have proved influential on the president’s trade policy.

Drug companies that commit to moving production to the U.S. will face a 20% tariff and no tariff if they also agree to lower prices.

Trump is trying to lower the drug costs for Americans. The president wants to require small airports to use private security contractors, a policy some Republicans would like to see imposed nationwide.

President Trump announced worldwide tariffs a year ago. He later lost at the Supreme Court, prompting the administration to look for ways to bypass the high court.

BOLSTERING DOMESTIC MANUFACTURING OF STRATEGIC METALS AND THEIR DERIVATIVES: Today, President Donald J. Trump signed a Proclamation to strengthen tariffs

Trump is counting on raising prices on goods from overseas to spur production at home. It’s a line of thought that makes trade policy experts and economists wince. But it appears to be as close as it gets to a core belief for the president.