Volume can be a useful tool for traders. Trading volume tallies the number of shares (for equities) or contracts (for futures) traded on a given day.
Price is king, but volume can indicate the force behind a price move. This provides valuable information.
For example, on our daily candlestick chart of JPM below, note that over the past few weeks, volume (overlaid on the chart) on down days (black bars) has been greater than volume on rebounds (red bars).
Low volume on a rebound is not a good sign. It tells me the bounce is more of a short-covering rally and adds weight to the evidence in favor of a continuation lower.
As with all indicators, there is no certainty; there is only probability.
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