Double Bottom
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The double bottom is an bullish pattern with a W shape. Two bottoms will succeed, reflecting an important support (below in green). This marks a reversal will. This pattern may also be in WV. We will speak about a triple bottom.
For the double bottom below, the area of support will allow the price to rebound twice. The first one will determine the neck line (here in red), evidenced by the highest between the two bottoms. Thereafter, the price will get back to the support. The magnitude of the two bottoms is normally the same (as in the case below), but it may happen that the first bottom is lower than the first. This configuration reinforces the validity of the figure because it reflects a breathlessness of the selling movement. A second rebound will then occur, but it is the breaking of the neck line that will validate the bullish reversal
Double Bottom
Once the neck line broken, it may happen that the price get back to it (this line becomes support), then increased again. The potential of increase is determined by the difference between the beginning support and the neck line (represented by black arrows).