RAFI® replication: Easier done than said?

We investigate whether adding fundamental indices to a portfolio provides increased diversification benefits. Our results show that equity investors who care only about portfolio mean and variance will benefit from including a fundamental index in their portfolios. This benefit is especially pronounced during periods of average stock market volatility. We also find that investors can construct a do-it-yourself buy-and-hold replicating portfolio that frequently outperforms the Research Affiliates Fundamental Index (RAFI ), exchange traded fund out-of-sample.