The Federal Reserve Bank of Boston's President and CEO Eric S. Rosengren speaks during the "Hyman P. Minsky Conference on the State of the U.S. and World Economies", in New York, April 17, 2013. REUTERS/Keith Bedford

TOPSHOT - French economy minister, Emmanuel Macron (C) gestures as he prepares to return by boat to the Economy Ministry after tendering his resignation in Paris on August 30, 2016. France's 38-year-old economy minister, Emmanuel Macron, will step down on August 30, aides said, fuelling speculation that he will bid for the presidency in next year's elections. "He told his cabinet... that he would leave the government after he tenders his resignation to the president this afternoon," one of his aides said. / AFP PHOTO / LIONEL BONAVENTURELIONEL BONAVENTURE/AFP/Getty Images

France's former Minister of the Economy Emmanuel Macron looks on as he leaves the TF1 headquarters after taking part in the broadcast news of the French television channel TF1 in Boulogne-Billancourt, outside Paris on August 30, 2016. France's Emmanuel Macron vowed after stepping down as economy minister to "transform" an ailing country but stopped short of declaring a presidential run. The 38-year-old said he had "seen at first hand the limits of our political system" and that quitting the government of President Francois Hollande would enable him "to be free" to push forward his own agenda. / AFP PHOTO / MATTHIEU ALEXANDREMATTHIEU ALEXANDRE/AFP/Getty Images

France's former Minister of the Economy Emmanuel Macron looks on during a press conference on August 30, 2016 in Paris, following his resignation as economy minister. France's Emmanuel Macron resigned as economy minister on August 30, the presidency said, fuelling rumours the 38-year-old will stand for president in next year's elections. Macron quit "to dedicate himself entirely to his political movement", the presidency said, referring to "En Marche" (On the Move), which he founded in April. Macron will be succeeded by France's Minister of Finance, Michael Sapin. / AFP PHOTO / MATTHIEU ALEXANDREMATTHIEU ALEXANDRE/AFP/Getty Images

France's former Minister of the Economy Emmanuel Macron looks on during a press conference on August 30, 2016 in Paris, following his resignation as economy minister. France's Emmanuel Macron resigned as economy minister on August 30, the presidency said, fuelling rumours the 38-year-old will stand for president in next year's elections. Macron quit "to dedicate himself entirely to his political movement", the presidency said, referring to "En Marche" (On the Move), which he founded in April. Macron will be succeeded by France's Minister of Finance, Michael Sapin. / AFP PHOTO / MATTHIEU ALEXANDREMATTHIEU ALEXANDRE/AFP/Getty Images

*** BESTPIX *** STUTTGART, GERMANY - AUGUST 30: (EDITORS NOTE: PICTURE WAS TAKEN WITH A FISHEYE LENS) General view of a tunnel at the construction site of the Stuttgart 21 railway station construction site on August 30, 2016 in Stuttgart, Germany. The Stuttgart 21 project, also called S21, encompasses not only a new main railway station for the city but also an urban development program and 50 kilometers of rail tunnels. The project has provoked large-scale protests by people angry over the planned uprooting of trees in an adjacent park as well as those critical of the enormous financial cost. A ground-stone laying ceremony for the new railway station is scheduled to take place in September. (Photo by Thomas Niedermueller/Getty Images,)

France's former Minister of the Economy Emmanuel Macron speaks during a press conference on August 30, 2016 in Paris, following his resignation as economy minister. France's Emmanuel Macron resigned as economy minister on August 30, the presidency said, fuelling rumours the 38-year-old will stand for president in next year's elections. Macron quit "to dedicate himself entirely to his political movement", the presidency said, referring to "En Marche" (On the Move), which he founded in April. Macron will be succeeded by France's Minister of Finance, Michael Sapin. / AFP PHOTO / MATTHIEU ALEXANDREMATTHIEU ALEXANDRE/AFP/Getty Images

France's former Minister of the Economy Emmanuel Macron speaks during a press conference on August 30, 2016 in Paris, following his resignation as economy minister. France's Emmanuel Macron resigned as economy minister on August 30, the presidency said, fuelling rumours the 38-year-old will stand for president in next year's elections. Macron quit "to dedicate himself entirely to his political movement", the presidency said, referring to "En Marche" (On the Move), which he founded in April. Macron will be succeeded by France's Minister of Finance, Michael Sapin. / AFP PHOTO / MATTHIEU ALEXANDREMATTHIEU ALEXANDRE/AFP/Getty Images