secolton...forget about the market maker...they do not have the available time to mess around
orders get routed through an individuals broker...or routed by choice...or buried in "arca"..etc
it's not the market maker lowering or raising anything....it is a buyer and seller setting a quote that will get it's bid or ask(hopefully)...routed through any given market maker..or specialist---they "make the market" with what they see
but yes...there is always manipulation...that lies within every human being....
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