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Sun Tzu's eight rules regarding the boundaries of competition and production.
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This article explains that only within our span of control do we have good information and control of our resources. Both physically and philosophically, the area that we control is relatively tiny when compared to areas we do not control. The most powerful person in the world can utilize only a tiny fraction of the world's resources. Our area of control is tiny compared to the vast expanse of areas where we have no control. The good news is that this means that there are almost an infinite number of strategic opportunities. The challenge is discovering them, which is why so many of the principles of strategy involve collecting and filtering information.