Richard Foster, who was for twenty-two years a director and senior partner of the well-known business consultants McKinsey & Company, analyzed the tenure of companies on these lists and discovered that it has been regularly decreasing over the past sixty years. For example, he found that in 1958 a company could expect to stay on the S&P 500 for about sixty-one years, whereas today it’s more like eighteen. Of the Fortune 500 companies in 1955, only sixty-one were still on the list in 2014. That’s only a 12 percent survival rate, the other 88 percent having gone bankrupt, merged, or fallen from
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