The S&P 500 is locked in a 100 point trading range (2040-2140) since March because of a serious split in sector performance. At less than 5% this is the narrowest range in several years. Note that Bollinger Bandwidth on the weekly chart reached a 20+ year low in July. This means the Bollinger Bands are at their narrowest in over 20 years. How’s that for a contraction. John Bollinger theorized that a volatility expansion often follows a volatility contraction. Chartists, therefore, should prepare for significant move in the coming weeks or months.