Since 1965, Berkshire Hathaway has compounded shareholder capital at a nearly 20% annualized rate. That unbelievable performance was under the stewardship of Warren Buffett, arguably the best investor ever.The Oracle of Omaha's most lucrative idea might have happened in the past decade, though. Shares of this consumer-facing enterprise have soared 749% in the last nine years (as of July 15), producing a huge dollar gain for Berkshire. Despite numerous stock sales over a four-quarter stretch from the fourth ...