Burlington Northern acquisition puts Buffett in index's sights
                                
                                
                                    (Newser) -
                                    Could Warren Buffett finally be headed to the S&P 500? For years, Berkshire Hathaway’s stock—both the A shares and the so-called “Baby Berkshire” B shares—have been too expensive for the index, at $101,000 and $3,380 each, respectively. But now that Berkshire has acquired...