There are other reasons (volume, Fibonacci Extension, patterns, Waves Personality, ...) which I won't go into now.
According to John Bollinger:
Periods of low volatility (When Bollinger Bands are close together) are often followed by periods of high volatility.
Note
Note
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Disclaimer
The information and publications are not meant to be, and do not constitute, financial, investment, trading, or other types of advice or recommendations supplied or endorsed by TradingView. Read more in the Terms of Use.