SOME things about Warren Buffett never change, including his non-stop jokes, famous annual letter and his reputation as the world's best investor. What is less understood is that over the past decade Mr Buffett's company, Berkshire Hathaway, has sharply altered its strategy. For its first 40 years Berkshire mainly invested in shares and ran insurance businesses, but since 2007 it has shifted to acquiring a succession of large industrial companies.
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