What are they? Bollinger Bands are a pair of trading bands representing an upper and lower trading range for a particular market price. A market price or currency pair is expected to trade within this upper and lower limit as each band or line represents the predictable range on either side of the moving average. The lines are plotted at standard deviation levels above and below the moving average. This trading band technique was introduced by John Bollinger in the 1980.
clipped from bgforex.blogspot.com
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