Typically a market bottom is accompanies by very high volume. Market bottoms come in many forms of price patterns but generally you want to see a place where downward momentum slows and it becomes more and more difficult for the market to move lower without meeting support for the price at each lower interval. At the same time volume increases short interest all but disappears and it becomes more evident that traders are inclined to buy and accumulate shares. There will also generally be extremely oversold readings on the weekly, daily, and hourly charts.
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