$SAND 1-hour trading volume was approximately $5.1 million, 4.6 times the previous average; the price rose 3.13% over the same period.
What does this figure tell us?
Short-term spikes in trading volume can be quite random. A large volume in one or two candlesticks may simply reflect a single concentrated trade; sustained high volume over several candles is more convincing.
The same data can mean very different things in different market conditions, so don't blindly apply a single rule.

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