I think there's a fundamental misunderstanding on how these markets work. A sell =/= a buy. Market makers agree to create a market. As part of that agreement, they agree to take the shares from a seller in the event there is no buyer, they also agree to provide shares to a buyer in the event a seller doesn't exist (assuming there are a surplus of shares to sell, if a stock is sold or they obviously can't produce more) but the notion that a buyer exists for every sell simply isn't necessarily the case.
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