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The Bottom Line

While every strategy has its drawbacks, Bollinger Bands® are among the most useful and commonly used tools in spotlighting extreme short-term security prices. Buying when stock prices cross below the lower Bollinger Band® often helps traders take advantage of oversold conditions and profit when the stock price moves back up toward the center moving-average line.

Are There Any Limitations to Bollinger Bands?

Yes. One of the main limitations is that it shouldn’t be used as a standalone tool. In fact, Bollinger Bands® should be used with other non-correlated indicators. Doing so may give you additional market signals that are much more direct. Another drawback is that they are calculated using a simple moving average. That’s because older price…

What Are Bollinger Bands?

Bollinger Bands® are tools used in technical analysis. They were designed by John Bollinger, a technical trader. The bands are used to generate signals for securities that are oversold or overbought. The bands are composed of different lines that are plotted on a chart, including the moving average, an upper band, and a lower band.

Drawing the Lines

Upper resistance and lower support lines are first drawn and then extrapolated to form channels within which the trader expects prices to be contained. Some traders draw straight lines connecting either tops or bottoms of prices to identify the upper or lower price extremes, respectively, and then add parallel lines to define the channel within…

Understanding Bollinger Bands

Bollinger Bands® consist of a centerline and two price channels or bands above and below it. The centerline is typically a simple moving average while the price channels are the standard deviations of the stock being studied.2 The bands expand and contract as the price action of an issue becomes volatile (expansion) or becomes bound into a tight trading pattern…