"Vigorous inter-dealer competition was seen as assuring
efficient price discovery, narrow spreads, absence of collusive
opportunity, and the self-enforcing effects for which self-
regulation strives."
But what happens when BATS, NSDQ, EDGX and ARCA, and serial securities fraudsters like Citadel form a racket to trade and oppress individual investors!!! That is the subject of or complaint now to the SEC!