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Text: The use of NAME_1 varies widely among traders. Some traders buy when price touches the lower Bollinger Band and exit when price touches the moving average in the center of the bands. Other traders buy when price breaks above the upper Bollinger Band or sell when price falls below the lower Bollinger Band.[4] Moreover, the use of NAME_1 is not confined to stock traders; options traders, most notably implied volatility traders, often sell options when NAME_1 are historically far apart or buy options when NAME_2 are historically close together, in both instances, expecting volatility to revert towards the average historical volatility level for the stock.

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