A couple of months back, I noted that despite all the attention paid to Silicon Valley’s startup economy, overall entrepreneurship in the U.S. has been falling for more than three decades. Last week, economists Ian Hathaway and Robert Litan at the Brookings Institution highlighted a related trend: American companies are getting older. In 1992, 60 percent of Americans worked for companies that had been around for at least 16 years. Today, that share tops 70 percent.
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