A much-ballyhooed new book that was touted as helping Baby Boomers figure out the magic savings number they each will need to be prepared for retirement has fallen way short of sales targets, The Wall Street Journal reports.

"The Number," which debuted in January, was supposed to sell big, so big that its publisher, Free Press, printed 125,000 copies, whereas most books about retirement are considered successful when they sell 50,000 copies.

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