The big difference between an active private investor who makes losses and a successful professional trader is the discipline factor. As a rule, it is not due to a lack of knowledge on the part of the private investor, but rather the sudden change from one technology to another. A professional trader who does not stick to the trading plan will fall out of favor with his superiors, even if the trade was profitable. A retail investor often has difficulty sticking to his own trading rules or systems when things get exciting. Discipline prevents emotions such as fear and greed from taking over. Support clear rules for the profit and loss statement.