CNN  —  Tariffs are costing automakers billions, but they’ve announced little in the way of car price hikes. While that’s good for car buyers, it’s not necessarily good for the American economy. Costs have ballooned for car companies after the Trump administration imposed 25% tariffs on imported cars — nearly half the US car market — as well as an additional 25% on imported parts, which every car built here depends on. Automakers would raise prices by double-digit percentages if they could –