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so it was just a limit order book originally.
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The history of this--I guess one thing I wanted to--
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what I was leading up to is that the ECNs are history now.
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They've been generally merged and acquired.
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Notably, the New York Stock Exchange,
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which has been the holdout doing floor trading,
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bought Archipelago
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because Archipelago was growing
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so fast doing this kind of electronic trading;
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it was really catching on.
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New York Stock Exchange began to worry
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that it was starting to get behind the times.