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Got it...I understand why dark pools exist but what is the purpose of regional exchanges such as NYSE ARCA?

Thank you, thats very helpful. Is it impossible for a NBBO to be taken from a dark pool?

I recently read that 40% of all U.S. stocks trade in dark pools. Interactive Brokers states that IB included eight dark pools in its smart routing logic. I've read article on this topic but do not completely understand how dark pools work. If a trade does not occur on the primary exchange...