In this Aug. 5, 2014 file photo, Michael Bloomberg welcomes leaders to the U.S.-Africa Business Forum during the U.S.-Africa Leaders Summit at the Mandarin Oriental Hotel in Washington. The former New York Mayor is returning to lead the financial data and news company he founded in 1981 but left to serve three terms in City Hall. Bloomberg LP said Wednesday, Sept. 3, 2014, current CEO Daniel Doctoroff will step down at the end of the year. (AP Photo/Jacquelyn Martin, file)
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