"In recent weeks, stocks in the Standard & Poor's 500-stock index have shown an increasing tendency to move in the same direction at the same time. Last week, those stocks' tendency to move in the same direction as the index hit an extreme not seen since October 1987, according to research by investment group Birinyi Associates in Westport, Conn."
in WSJ
Related ETF`s: SPDR S&P 500 ETF (Public, NYSE:SPY), ProShares UltraShort S&P500 (ETF) (Public, NYSE:SDS), SPDR Dow Jones Industrial Average ETF (Public, NYSE:DIA)
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