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A record number of people in the U.S. now live by themselves -- and they spend $1.9 trillion a year. Businesses are beginning to take notice.By Eric Klinenberg, contributorFORTUNE -- In 1957, Universi
A record number of people in the U.S. now live by themselves -- and they spend $1.9 trillion a year. Businesses are beginning to take notice.By Eric Klinenberg, contributorFORTUNE -- In 1957, Universi