We're not claiming an automated Buffett strategy will out-perform Buffett, but we think it is a useful exercise to see how Buffett concepts and metrics perform over the long-term using rules-driven approach.
Kenneth Fisher highlighted the use of the price-to-sales ratio as a quick and easy metric to find potentially undervalued companies. He reasoned that, "any stock with a low price relative to its previous 12-month sales would rise if its future earnings became large enough to translate into a low future PE"