Trading provides one of the last great frontiers of opportunity in our economy. It is one of the very few ways in which an individual can start with a relatively small bankroll and actually become a multimillionaire. Of course, only a handful of individuals succeed in turning this feat, but at least the opportunity exists. A rigid stop-loss rule is an essential ingredient to the trading approach of many successful traders. Winning streaks lead to complacency, and complacency leads to sloppy trading.