Correlations Highest Since 1987

And you know what that means.  

WSJ: The Herd Instinct Takes Over

The market's flock-like behavior is one more reflection of the growing influence of investors using broad-based strategies to buy and sell large blocks of stocks. Instead of picking individual stocks to hold over a period of time, they trade in and out of the market using broad indexes. Often, these investors use exchange-traded funds, which trade as easily as a single stock but contain many different stocks that may belong to the S&P 500, the Nasdaq 100 or another index.

Heavy trading in exchange-traded funds means more stocks are likely to move in the same direction on any given day. Analysts call that correlation, a mathematical term meaning similarity of behavior. Correlation is on the rise, to the frustration of investors who are trying to analyze stocks based on their underlying strengths and weaknesses.

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