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there are different approaches
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and there are going to be clever people
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who come up with new ideas about how to trade stocks.
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This brings us to the so called ECNs.
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They were called electronic communications networks
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and what happened was with the advent of the Internet in the mid-1990s,
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people started setting up websites that looked like stock exchanges,
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but maybe they weren't.
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I guess the first one was Instinet--
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I'm not sure it's the absolute first one, but Instinet was--
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now, understand that an exchange has to register with the SEC.
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The SEC has all kinds of requirements,