Premarket: World stocks, greenback nudge higher on U.S. autos tariff relief

World stocks and the dollar edged up on Tuesday after U.S. President Donald Trump's administration said it planned to reduce the impact of auto tariffs, a further sign of flexibility on a trade policy that has wreaked havoc on markets in April. Market focus was also turning to the early signs of the impact tariff pain is having from economic data and the latest company earnings. European shares and U.S. stock futures traded higher . Canada's dollar dipped against a broadly-firm U.S. currency as Canadian Prime Minister Mark Carney's Liberals retained power in Monday's election, but fell short of the…