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Justin Mamis – When To Sell

when-to-sell
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How Professionals Minimize Losses page 73-75:

Blaming ‚them’ is a psychologically and socially acceptable way to avoid blaming oneself. Yet professionals can, and do, make mistakes. When they buy a stock and it doesn’t go up (even if it doesn’t go down) that’s wrong enough for them, simply because it did not perform as expected. The pro reasons that the stock went against his judgement, so he sells it. And he doesn’t expect to be perfect, any more than a professional baseball player expects to bat 1.000. Knowing that losses are inevitable, he seeks to minimize them at all times. To be sure, his ability to take a small loss is enhanced by the benefit of not having to reckon with commission costs, but even so, if he were relatively incompetent he wouldn’t last long in the business; the loss might be less, or slower to pile up, but the return on invested capital would be dismal enough eventually to send him to another field.

Rule One of the professional trader is: When a stock doesn’t do what you expect it to do, sell it. (more…)