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Non-Tech : Bid /Ask Spreads - Market Manipulation

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From: Justinfo9/11/2013 12:27:03 AM
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Another tidbit: brokerages have this habit of holding orders placed until they match it with other clients and therefore earn double the commission. Specifically routing trades through NYSE allows for tape watching and if a fill is not executed, they will have to correct it.

And apparently some brokerages(I don't know which ones) sell this data to third parties, now I have no idea how it is being used but I suppose it's safe to assume its made profitable somehow :)
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