TOPSHOT - Shop sellers pose as they wear face masks as a preventive measure against the spread of the new coronavirus, COVID-19, in downtown Sao Paulo, Brazil on March 16, 2020. - The Sao Paulo stock exchange closed down 13.9 percent Monday and the Brazilian real closed below five to the dollar for the first time ever in further fallout from the coronavirus pandemic. (Photo by NELSON ALMEIDA / AFP)