The head of the International Monetary Fund said uncertainty around US President Donald Trump’s threatened tariffs risks denting global economic activity. “The sooner there is more clarity, the better,” IMF Managing Director Kristalina Georgieva said in an interview with Reuters on Monday. “Because uncertainty — our research shows — the longer it goes, the more it may negatively impact growth.” "The fund is seeing signs in recent data that consumer and investor confidence is weakening “and we know that that then translates into impacts on growth prospects,” Georgieva said.