Ebola to Alibaba Trigger Debate Over Cause of Stock Slide

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Nicholas Colas was sitting in the green room, waiting to go on television in the pre-market hours of the morning of Sept. 19.

While the chief market strategist at ConvergEx Group LLC was booked to talk about Alibaba Group Holding Ltd.’s first day of trading, the state of the overall market was also on his mind. The two subjects were not necessarily unrelated.