Working-class car buyers will be the hardest hit by U.S. President Donald Trump's 25% tariff on imported vehicles because almost all low-cost new cars sold in the United States are built elsewhere. Lower-income buyers will suffer another blow from expected hikes in used car prices as demand surges and supply shrinks. New cars priced under $30,000 are already rare as the average new-vehicle price approaches $50,000. The only way automakers can eke out profits on economy cars, analysts say, is to build them in nations with lower manufacturing costs.