Whenever he's evaluating an investment, the first question Warren Buffett asks himself is if he understands the business. To put it another way, the Oracle of Omaha will only consider stocks for his investment portfolio at Berkshire Hathaway if they fall into his circle of competence.
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Buffett invented the idea of the circle of competence several decades ago, and it has since become a universal principle in investing. And today it's more important than ever to...

