Visitors walk past a portrait of late communist leader Mao Zedong on Tiananmen Gate in Beijing on Sept. 30, the eve of National Day. Greg Baker/AFP/Getty Images hide caption

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Two recent tallies of the world's richest people agree on the broad points — but not on which continent has the most billionaires. Here, U.S. dollars are counted, with Chinese yuan notes in the background. STR/AFP/Getty Images hide caption

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