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When it is used as an oscillator, a positive value indicates an overbought market while a negative value indicates an oversold market.
Many traders use them primarily to determine overbought and oversold levels, selling when price touches the upper Bollinger band and buying when it hits the lower Bollinger band.
The second condition we need is of course an overbought market.
In the early stages of a new trend, these indicators can stay in the overbought part of the scale for a very long time, particularly at the start of a new bull market.
In any extreme situation investors forget to be selective, and this is common to overbought and oversold markets.
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