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Traders say 1987-style crash could happen again

Investors are looking over their shoulder. That’s because today is the 30th anniversary of "Black Monday," which is considered the worst day in history for the U.S. stock market. That's when the S&P plunged 20.5% and the Dow tumbled more than 22%. Yahoo Finance’s Alexis Christoforous, Myles Udland and Seana Smith figure out if we at risk of this happening again?