Bollinger bands are used by traders in many different ways, and John Bollinger himself has his own set of rules and guidelines, which can be found on his Web site, BollingerBands.com.

FORBES: Gain an Edge with Volatility Analysis

Cheerfully admitting that he has been making up his own rules in order to try to save the game, he has apologised in the way the Russians demanded.

ECONOMIST: From the archive

His government has tightened accounting rules to make business more open, given minority shareholders and institutional investors more say in corporate affairs and opened South Korea's capital markets.

ECONOMIST: South Korea