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21.5% annual compound return for over 40 years from
Berkshire Hathaway is the best I've ever heard of
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Joel Greenblatt's fund supposedly has a 40% annual return for 20 years. But I think he cheats by keeping his fund under $1B and making it as easy as possible.
I view guys like that akin to a ballplayer hitting .370 over the first 5 years of his career. Let's see what he hits at the end of his career before we put him alongside Ty Cobb.