Iappreciate that Warren Buffett keeps us guessing. The longtime CEO of Berkshire Hathaway ( BRK.A 0.14% ) ( BRK.B 0.23% ) is retiring at the end of this month, but he leaves a powerful legacy as one of the greatest investors to have ever lived.

Buffett has famously focused on companies that aren't flashy, such as those in the credit card, financial services, insurance, and consumer staples sectors, which are easily understood, undervalued, and have a strong competitive moat. Buffett made a significant amount of money with his investing philosophy, leading Berkshire Hathaway's portfolio to outperform the S&P 500 by far for the duration of his career.

But Buffett's also willing to change, and he's never one to leave the stocks of great companies on the table. So, it's i

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