Though all trades are both buys and sells, they can be classified as one or the other. If a trade takes place at the bid price, it is called a sell. If it takes place at the ask price it is called a buy. Also many charts assign a color to trades. A trade that causes the price per share to increase is usually green, while a trade that doesn't cause the pps to rise or causes it to drop is red. So it is possible for a trade that is classified as a buy to nevertheless be red. Buys, sells, red and green are just classifications. In all cases someone has sold to someone who has bought.
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