Warren Buffett has carved out a core stock-picking strategy of investing in companies with strong economic “moats,” businesses that have built, fortified and generated success from well-known brands that make it difficult for them to succumb to competitive forces. Stalwarts like International Business Machines (IBM.N), Coca-Cola Inc (KO.N), Procter & Gamble Co (PG.N) to name a few have showed declining revenue trends in recent years, and face competition that may make it more difficult for them to outperform the market in the way they did in the past.