"From November 1976 to the end of 2011, Warren Buffett delivered an average annual return of 19% in excess of the Treasury bill rate, as measured by shares of his publicly traded conglomerate, Berkshire Hathaway (BRK.A, BRK.B), versus a 6.1% average excess return for the stock market. In addition, Berkshire’s Sharpe ratio — a measure of return per unit of risk — is higher than all U.S. stocks that have been traded for more than 30 years from 1926 to 2011, as well as all U.S. mutual funds in existence for more than three decades.
So how does he do it? "
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