Robert Frank, CNBCMarch 14, 2013 16:12
According to data from Spectrem Group, the Chicago-based wealth research firm, there are now 8.99 million U.S. households whose net worth totals $1 million or more (not including primary residence). That's up from 8.6 million in 2011 and just short of the all-time record set in 2006, when the United States had 9.2 million millionaire households.
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