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Fund managers challenge cap-weighted indexing with RAFI fundamentals approach

The RAFI methodology, created by Research Affiliates after Rob Arnott founded the firm in 2002, weights holdings using audited accounting metrics instead of stock prices.

Reported · Written up by our desk · Fund Industry

Investors often default to passive, market-cap-weighted equity indexes, a model commonly used in funds tracking benchmarks such as the S&P 500 or MSCI World, but ETF Trends argues the approach contains a structural weakness.

In a market-cap-weighted index, a company’s index weight moves directly with its stock price, which means rising prices increase a holding’s weight regardless of business fundamentals. ETF Trends says this can create performance drag when overvalued large companies eventually pull back, since the index is still forced to reflect market consensus rather than audited measures of scale or cash generation.

ETF Trends points to Research Affiliates, founded by Rob Arnott in 2002, and says the firm pioneered the Research Affiliates Fundamental Index, launched three years later. The RAFI approach is described as decoupling portfolio weight from share price by sizing companies based on audited accounting metrics intended to better reflect real-world business scale or economic footprint.

According to ETF Trends, the cap-weighted model can leave funds systematically buying more of what has become expensive and less of what may show value, particularly during periods of concentration and speculative valuation. The outlet frames fundamental indexing rules as a way for investors to reduce exposure to that market-price linked mechanism.

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