As it relates to order flow, what is considered “better execution” the folks on CNBC taunt retail investors/traders with?

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I don’t understand this; the use of dark pools, etc… how are things “better”, how does it work?

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Why does Citadel want my order flow if they’re not doing anything illegal?

In: Economics

Micro-seconds matter in electronic trading. Having market activity data a nanosecond before others can allow you to trade in that data profitably.