No chart pattern is more common in trading than the double bottom or double top. In fact this pattern appears so often that it alone may serve as proof positive that price action is not as wildly random as many academics claim. Price charts simply express trader sentiment and double tops and double bottoms represent a retesting of temporary extremes. If prices were truly random, why do they pause so frequently at just those points? To traders the answer is that many participants are making their stand at those clearly demarcated levels.