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Re:How High Frequency Trading Benefits All Investors by kscaldef on Wednesday March 17, 2010 @02:01PM (#1199198)
It actually seems to be more like a quadruple-negative. Let's try to simplify.

"No serious market observer disputes the claim that volatility would not be higher without the liquidity provided by high frequency traders."

"[serious market observers believe] that volatility would not be higher without the liquidity provided by high frequency traders."

"[serious market observers believe] that volatility would [be lower] without the liquidity provided by high frequency traders."

"[serious market observers believe] that volatility would [be lower] without ... high frequency traders."

"[serious market observers believe] that volatility [is higher with] ... high frequency traders."

"[high frequency traders increase volatility]"

This, of course, is exactly the opposite of what the author proceeds to argue in the following paragraphs. My conclusion is that the author managed to create a sentence so overly complicated that even he could not understand what he was saying.

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