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Like symmetrical triangles, breakouts to the upside require a volume surge upon breakout, but the best breaks to the downside occur on average volume only to see volume ramp up as the stock falls.

Bearish rectangles appear in downtrends and typically resolve themselves to the downside. Breakdowns do not have the same volume or movement requirements as their opposite upside breaks. In fact, when stock breaks support with a massive volume surge, it often signals that of a capitulation sell-off and the stock rebounds shortly after. The best downside breaks occur on average volume followed by the stock drifting lower for a few days on increasing volume. Psychologically, when a stock first breaks support, stockholders become concerned; many of them show a loss and some sell. As the stock trades lower, concern becomes fear and the selling accelerates. Then fear becomes panic, and people sell regardless of price. This is why there typically is a delayed volume surge with breaks to the downside.

If the rectangle is large, the expected price movement is approximately equal to the height of the rectangle. If the pattern is on the smaller size, then the expected price movement should mirror the price movement preceding the pattern.

On a side note, rectangles are difficult to play. Symmetrical triangles have converging trendlines, and therefore must break by a certain day. But since rectangles have parallel trendlines – and therefore theoretically can go on for many months - no time horizon is offered as to when the stock will most likely break.