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Forget conventional wisdom. In Focus: The Future of Your Company Depends on It (HarperBusiness, $25 cloth), author Al Ries argues against growing your company through rampant diversification. To the contrary, he atBODYs, the company that tries to be all things to all people ends up being--you guessed it--nothing to no one.

"It should [be] obvious that a company cannot keep expanding its product line forever," Ries explains. "You reach a point of diminishing returns. You lose your efficiency, your competitiveness, and most ominous of all, your ability to manage a diverse collection of unrelated products and services."

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