Argentina's President Mauricio Macri, top, shakes hands with Chile's President Michelle Bachelet, bottom left, after receiving the presidential sash from acting Senate President Federico Pinedo at the government house in Buenos Aires, Argentina, Thursday, Dec. 10, 2015. Macri, the former mayor of Buenos Aires who hails from one of Argentina's richest families, took the oath of office in Congress in front of legislators, several Latin American heads of state and other dignitaries.
Argentina's President Mauricio Macri, top, shakes hands with Chile's President Michelle Bachelet, bottom left, after receiving the presidential sash from acting Senate President Federico Pinedo at the government house in Buenos Aires, Argentina, Thursday, Dec. 10, 2015. Macri, the former mayor of Buenos Aires who hails from one of Argentina's richest families, took the oath of office in Congress in front of legislators, several Latin American heads of state and other dignitaries. Victor R. Caivano AP
Argentina's President Mauricio Macri, top, shakes hands with Chile's President Michelle Bachelet, bottom left, after receiving the presidential sash from acting Senate President Federico Pinedo at the government house in Buenos Aires, Argentina, Thursday, Dec. 10, 2015. Macri, the former mayor of Buenos Aires who hails from one of Argentina's richest families, took the oath of office in Congress in front of legislators, several Latin American heads of state and other dignitaries. Victor R. Caivano AP