Bollinger Bands can be a useful technical analysis tool for generating oversold or overbought indicators. Bollinger Bands are composed of three lines, a simple moving average (middle band) and an upper and lower band – the upper and lower bands are typically 2 standard deviations +/- from a 20-day simple moving average, but can be modified. Traders typically consider an underlying security to be overbought as the underlying`s price moves towards the upper band and oversold as the underlying price moves towards the lower band.
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