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In technical analysis, a measure of the amount of money going into or out of a given security. It is calculated by comparing a security's volume to its price over a given time. Technical analysts use on-balance volume to determine a security's momentum. A change in the on-balance volume indicates a coming change in the security's overall trend.
A measure of volume distinguished as to whether trades take place on rising prices or on falling prices. Technical analysts consider great volume on rising prices bullish because it indicates the possibility that large traders are accumulating investment positions in a security. Conversely, the technicians consider greater volume on falling prices bearish.