President Donald Trump has made tariffs the key economic buzzword of his second term in the White House, raising red flags for many economists and prompting a lot of everyday people to ask: What are tariffs?

Trump spoke to reporters from the Oval Office about his decision, saying it was an “amazing day.” When asked if prices would rise as a result of the tariffs, he said that they “could go up somewhat” at first, but then “prices will also go down.”

4.8%. That’s how much the U.S.’ weighted average tariff rate would be if Trump implemented the country-level strategy, Deutsche Bank economists led by Justin Weidner estimated in a Monday note. That’s a 3.3 percentage-point increase from the 1.5% effective rate U.S. imports had in 2022, according to the World Bank.