By offering a glimpse into the makeup of the country's next government, the outcome of Argentina's upcoming primary elections could spook markets, spur nationwide demonstrations and potentially even trigger a run on local banks. Argentina will hold primary elections on Aug. 13 to choose the candidates who will run in the country's October presidential and legislative elections. When it comes to the presidential race, polling indicates there are four main contenders: leftist Economy Minister Sergio Massa, conservative Buenos Aires Mayor Horacio Rodriguez Larreta, conservative former Security Minister Patricia Bullrich, and libertarian lawmaker Javier Milei....