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Yellen, Bull Markets and Extinction in a Seven-Year Stock Rally

  • Almost seven years in, current rally eclipses all but two
  • Elongated bull market makes investors question sustainability

Janet Yellen says economic expansions don’t die of old age. Neither do bull markets.

At almost 82 months, the advance in the Standard & Poor’s 500 Index that has lifted U.S. share prices threefold is poised to become the second-longest ever in 2016, eclipsing a stretch in the 1950s in which prices almost quadrupled. As the rally that has restored $15 trillion to share prices sails past milestones, it’s natural for investors to wonder if time itself becomes a barrier to progress.