Good Companies Don’t Always Make Good Stock Picks: John Dorfman

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As 2010 draws to a close, all of the biggest gainers in the Standard & Poor’s 500 Index and most of the biggest losers look like bad bets for next year.

As of Dec. 14, the index’s best performer for 2010 was Cummins Inc., a Columbus, Indiana, manufacturer of engines and power generators. The stock is up about 136 percent so far this year.