All volume represents both a buy and a sell. Volume is created by trades, as in shares moving between a buyer and a seller. Classifying volume as either a buy or a sell is really meaningless, except it can be useful to understand how many shares are trading during a given period of time when the pps is moving in a certain direction. But it doesn't mean that all those shares were either bought or sold. They were all bought and sold. That's volume. And classifying as either a buy or sell is particularly useless when the pps isn't changing.
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