'At The Money', Barry speaks with Rob Arnott, founder of Research Affiliates (RAFI). They discuss how cap weighted indexes have come to dominate ETFs, and why investors should consider a strategy based on fundamental weightings, such as profits or revenue growth. Each week, “At the Money” discusses an important topic in money management. From portfolio construction to taxes and cutting down on fees, join Barry Ritholtz to learn the best ways to put your money to work.