“The fabulously rich triumvir Marcus Crassus’s fortune was estimated around the year 50 BCE at some 200 million sesterces (HS). Crassus’s annual income could be estimated at 12 million HS. Thus expressed, Crassus’s income was equal to the annual incomes of about 32,000 people, a crowd that would fill about half of the Colosseum. Let us fast-forward more closely to the present and apply the same reasoning to three American wealth icons: Andrew Carnegie, John D. Rockefeller and Bill Gates.”
http://www.economicpolicyjournal.com/2013/01/who-was-richest-person-ever.html
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