Market Makers: Tricks of the Trade

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imo mms will often work together; moves are far too coordinated in general to be coincidence me thinks. also, i have read (someplace) that if a mm is in trouble (i.e. they're being squeezed by upward pressure on a stock), other mms will come to there aide, and in future, the favor is returned. traders often work together (illegally) to pressure a stock; why not mms?