Jack Bogle founded a financial services company, The Vanguard Group, that now has 16,600 employees and more than $5 trillion in assets. Bogle, who died last week at 89, could have parlayed that success into an unmatched fortune, but he proudly proclaimed that he was never close to becoming a billionaire. Instead, he focused on helping other people build wealth for retirement. "Jack could have been a multibillionaire on a par with Gates and Buffett," said William Bernstein, an Oregon...


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