How rare is an S&P 500 bear market?

Yahoo Finance Live's Brian Sozzi breaks down the stat of the day.

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BRIAN SOZZI: All right, the bears are doing some hunting on Wall Street. So we'll toss them a piece of salmon ahead of the weekend. And with this stat of the day, 14 times over the last 95 years, the S&P 500 has plunged more than 20%, meaning it has hit bear market territory. In just two of those examples did the US economy not shrink within a year-- 1987 and 1966. And the source for all this, Bloomberg.