At the time of writing, firms stay in the top league by size (the so-called S&P 500) for only about between ten and fifteen years. Companies exit the S&P 500 through mergers or by shrinking their business, both conditions leading to layoffs. Throughout the twentieth century, however, expected duration was more than sixty years. Longevity for large firms was greater; people stayed with large firms for their entire lives. There was such a thing as a company man (restricting the gender here is appropriate, as company men were almost all men). The company man is best defined as someone whose
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