Quote from smilingsynic:
How are you defining "money management"? You seem to be defining it as trend following (cut losses short, let profits run).
If the system has no edge, there will be few big profits to take, but there will be many small losses. After all, one cannot get water from a dry well.
In a trend following system that happens to be applied to a trending market, the system is responsible for the profits.
Poor money management (risking too much per trade) can bankrupt a trader who happens to have a winning system. But if a trader has a losing system, or is trading in a discretionary way according to unwarranted assumptions, no system of money management can turn that trader into a winner.
This principle is the reason why casinos win (as long as they limit max bets). The casinos have the edge, so they ultimately prevail. Gamblers might have their martingales and reverse martingales, and although individual gamblers might win on occasion, gamblers overall are losers, regardless of their money management systems.