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if exchanges get to cross orders between pennies or off-exchange loses the ability the whole jig is up and their profits almost disappear as their operating leverage plummets. its not a secret, (all BO brain damage ppl know it) and exchanges are lobbying for level playing field.
in 2009 when i was a backoffice baby i read the original Sigma X paper after hearing people railing on “dark pools” for weeks and it was like “oh so they just internalize order flow and cross it at midpoint to save clients money?” and it became a great litmus test of comentators
there is a perfect relationship between how cool the name of some financial plumbing piece is and how boring and Lawful Good the behavior is. the bad stuff always gets a generic boring name like “repo 105”
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retail 