Among them are Richard Foster and Innosight, who have been studying corporate longevity within the S&P 500—a curated list of publicly traded companies that represents the U.S. stock market. Their research shows that in 1958, the average tenure of a company on that list was sixty-one years. But by 2016 that number had been reduced to twenty-four years. The data suggests this pattern will continue. At the current rate of churn, about half the list will be replaced in the next decade. And by 2027 the average tenure will shrink to just twelve years. This fits with broader research recently
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