The number of billionaires in the U.S. has more than doubled in the last decade, from 267 in 2008 to 607 last year, according to UBS.

The number of billionaires in the U.S. has more than doubled in the last decade, from 267 in 2008 to 607 last year, according to UBS. https://t.co/SrGkl4VpTr

— NBC News (@NBCNews) July 4, 2019

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