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S&P 500 plunges nearly 6% in final hour of trade--but now circuit breakers can no longer save Wall Street from a more vicious drop
The S&P 500 SPX, 0.45% was down 5.9% in the final hour of trade Thursday, and if losses steepen in the final hour of trade, circuit breakers, intended to dampen volatility, can no longer prevent a horrific one-day implosion. So-called circuit breakers kick in when the S&P 500 falls by at lea
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