A Wall Street expert breaks down his precise 5-part strategy that could quadruple returns for investors buying the market's smallest companies

· Scott Opsal of Leuthold Group says he's found five measurements that can help investors identify the highest-quality and best-returning small-company stocks.
· All five elements are associated with better stock performance on their own, and the advantage increases when they're combined.
· Over the last 25 years, the...