10 Richest People of All Time and How They Made Their Money

Quick: who is the richest man of all time? Bill Gates? Warren Buffet? Not even close, though there's no denying they're very, very rich. The richest man of all time, when wealth is measured as a percentage of the national economy, was John D. Rockefeller, whose fortunes made Gates' and Buffet's look downright puny.

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