About 25% of all sell orders going thru are short orders. Please google what a short order is and you will learn that ALL short orders have an EXPIRATION PERIOD, typically 3 days upon which the seller has to "BUY BACK" or "COVER" his order... thus what we call a "SHORT SQUEEZE" happens: a reverse of a DUMP, it is technically based on panic from short sellers to BUY and they begin slapping each other's buys on the way up so they minimize their loses.
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