"A margin of safety is achieved when securities are purchased at prices sufficiently below underlying value to allow for human error, bad luck, or extreme volatility in a complex, unpredictable and rapidly changing world."

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You know, some people got no choice, and they can never find a voice, to talk with that they can even call their own. So the first thing that they see, that allows them the right to be, why they follow it, you know, it's called bad luck.

— Lou Reed