"I don't think you can consistently be a winning trader if you're banking on being right more than 50 percent of the time. You have to figure out how to make money being right only 20 to 30 percent of the time."

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Though the principles of the banking trade may appear somewhat abstruse, the practice is capable of being reduced to strict rules. To depart upon any occasion from those rules, is consequence of some flattering speculation of extraordinary gain, is almost always extremely dangerous, and frequently fatal to the banking company which attempts it.

— Adam Smith