John Bollinger is well known for having developed Bollinger Bands, trading bands (similar to moving average envelopes) that plot whether prices are high or low. Trading bands such as these forewarn the investor whether he should buy or sell, thus confirming general price action (not absolute buy or sell signals). This concept is used by many traders and investors in conjunction with a host of complimentary indicators. Bollinger's analytical approach to the market combines the best of technical analysis along with strong fundamental analysis.
