The most important and sustained way to boost a stock's PPS is with solid and growing positive increases in the company's performance and results quarter after quarter.
Yes, MM'S can definitely and unfairly with their own selfish methods and reasons hurt a stock's PPS - sometimes to a point where a company is never ever able to recover. I think there should be very, very strict enforcement very severe penalties and fines(including jail time) against the MM'S as there is to insider trading. It is an unlevel playing field in this regard and in a few other regards.
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