Premarket: World stocks slip as U.S. tariff threats heat up

World shares ticked lower on Monday, with European shares slipping as the latest salvo of threats in the U.S. tariff wars kept investors on edge, although there were some hopes this would prove to be mostly bluster by President Donald Trump. The pan-European STOXX 600 index was last down 0.3 per cent. Other regional indexes also declined, barring the Britain's FTSE 100, which was up 0.4 per cent. MSCI's broadest index of world shares dipped 0.1 per cent. Trump on Saturday said he would impose a 30-per-cent tariff on most imports from the European Union and Mexico from Aug. 1,…