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Rob Arnott | Focusing on Growth (Not Market Cap) | Masters in Business, Sonic AI
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Focusing on Growth (Not Market Cap) | Masters in Business
Masters in Business
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May 8, 2026
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14:12
Interview
Focusing on Growth (Not Market Cap) | Masters in Business
From
Masters in Business
Rob Arnott
(Founder, Research Affiliates, guest)
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Executive Summary
Market-cap weighted indexes like the S&P 500 are creating significant market concentration risk in a handful of mega-cap stocks.
Research Affiliates has developed a new 'RAFI Growth Index' that selects companies based on fundamental growth (sales, profits, R&D) and weights them by their dollar contribution to economic growth.
Backtested over 30 years, this methodology outperformed the Russell Growth index by 4.5% annually, and has continued to outperform in its first year of live tracking.
The index is not yet investable but is estimated to have a capacity of $1.5 to $3 trillion, offering a potential alternative for investors concerned with current index construction.
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Indexing Methodology Innovation
Redefining Growth Investing
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