Olu Sonola, the head of U.S. economic research at Fitch Ratings, said the economy was just “starting to see” the effects of the tariffs that Mr. Trump announced in the spring, adding that with Mr. Trump’s newest duties now in place, Americans would “see that magnified” in coming months.

President Trump celebrated his sweeping new tariffs finally taking effect on dozens of trading partners early Thursday. Why it matters: Trump's tariff policy has begun to impact some businesses, which warn they'll have to pass costs onto consumers.

The twists and turns in U.S. President Donald Trump's tariff policies have not only roiled global financial markets but also taken investors on a roller-coaster ride. Adding to the uncertainty are tariff-related legal challenges and Trump's assertion that he will hammer out bilateral deals with trade partners.