Active versus Passive: Old Wine in New Wine Skins

Published in The Journal of Portfolio Management, February 2022.

Executive summary

The cap-weighted index sits at the center of the active-versus-passive debate, but the paper argues that much of what looks like a skill question is really an index-concentration and monetary-policy question. Over 30 years of S&P 500 history, real M2 growth and long-term bond rates help explain when the index becomes highly concentrated and when cap weighting beats equal weight, risk parity, or simulated stock-selection skill.

A skilled manager beating the S&P 500 by 4% annually over 30 years can still lag during short episodes of excessive monetary expansion, then win by several percent in normal-liquidity regimes roughly 80% of the time. The paper frames those reversals as consequences of Fed policy and concentration cycles, not sudden changes in manager skill. As concentration eases, stock selection and risk management regain importance.

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