Generally, high volume is bearish and low volume is bullish. High volume bull candles tend to be bottoms and the volume tapers off as it runs up. One way to spot a coming reversal, is spotting a a substantial volume drop off from the previous candle/trend. Volume drops off when the momentum of the up/down move is exhausted. Those who were gonna sell or buy the move have already done so.
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Learn to read volume, if nothing else. It will show you the way.
