Volatility bands around price
Bollinger Bands = middle band (usually 20 SMA) plus upper/lower bands at ±2 standard deviations. Bands widen in volatile periods, contract in quiet periods.
- Price at upper band — strong relative to recent range (not automatic sell).
- Squeeze — bands narrow; volatility expansion sometimes follows.
Use with Module 6–7 context — bands alone are not a complete system.