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Technical Analysis: the concepts of overbought / oversold don't make sense
You are right that every transaction involves a seller and a buyer. The difference is the level of willingness from both parties.  Overbought and oversold, as I understand them (particularly in the context of stocks), describe prolonged price increase (overbought, people are more willing to buy than sell, driving price up) and price decrease (oversold, people are more willing to sell than buy, driving price down).