At any moment, one company stands in the spotlight of the middle ring in the stock market's never-ending circus. It may not be the biggest corporation in the world, or the most profitable, but somehow it both mirrors and leads the market's broader action.

As they grow, companies saturate their markets, become more complex and difficult to manage, and face larger and more entrenched competitors.

Many newly public companies are able to post a year or two of strong sales growth off a small base, but their growth almost always slows over time, thanks to what investment professionals call 'the law of large numbers.'

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