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Bernard Arnault surpassed Elon Musk as the world's richest person on Dec. 7, according to Forbes, though the No. 1 and 2 rankings continue to fluctuate. Arnault controls the massive luxury conglomerate LVMH Moët Hennessy - Louis Vuitton. All of Arnault's children work at LVMH brands, including Louis Vuitton, Berluti, and TAG Heuer. See more stories on Insider's...