Everyone makes mistakes. Some repeat their mistakes and suffer continuously. The smart ones learn from their own mistakes and call it experience. But the geniuses are a special breed, they’re the ones that learn from the mistakes of others. Here’s what Bruce Kovner has to say about this subject: “You have to be willing to make mistakes regularly; there is nothing wrong with it. Michael [Marcus] taught me about making your best judgment, being wrong, making your next best judgment, being wrong, making your third best judgment, and then doubling your money. Whenever I enter a position, I have a predetermined stop. That is the only way I can sleep. I know where I’m getting out before I get in. The position size on a trade is determined by the stop, and the stop is determined on a technical basis. I never think about other people who may be using the same stop, because the market shouldn’t go there if I am right. Place your stops at a point that, if reached, will reasonably indicate that the trade is wrong, not at a point determined primarily by the maximum dollar amount you are willing to lose. If you personalize losses, you can’t trade.”