US president Donald Trump's tariff policy is reducing values on markets worldwide and the New York Stock Exchange is no exception. Photograph: Spencer Platt/Getty Images US president Donald Trump threatened further escalation of tariffs on Monday as global markets again plunged, wiping billions of dollars and euros of the values of companies, savings and pension funds. Mr Trump said he would impose a further 50 per cent tariff if China did not withdraw its retaliation to earlier US tariffs – a move which would mean tariffs on Chinese imports to the US would be 104 per cent, White House officials...