A trader works on the floor of the New York Stock Exchange. Markets extended a global selloff on April 4th as countries around the world reeled from US president Donald Trump's trade war. Photograph: Getty Ongoing uncertainty roiled global markets amid a sharp escalation in the trade war and tit-for-tat tariffs that could squeeze growth this year. China, which is currently facing 54 per cent tariffs on exports to the US, retaliated with additional tariffs of 34 per cent on all US goods from April 10th, intensifying a trade war between the two major global economies. Dublin The Irish index...