Not All Factor Exposures Are Created Equal

Published in The Journal of Portfolio Management, Quantitative Special Issue 2018.

Executive summary

Quant equity has moved from pure alpha-factor optimization toward transparent smart-beta construction, but factor exposure alone does not define portfolio quality. The paper compares factor-weighted, cap-weighted, equal-weighted, and risk-parity portfolios applied to eight Barra GEM LT factors, holding factor exposure constant where possible.

Once the target factor tilt is in place, how the portfolio is built matters as much as the factor itself. Factor-weighted and equal-weighted approaches can embed unintended sector concentrations and cyclical or defensive tilts. Risk-parity weighting delivers the same factor exposure with better diversification and a more defensive return pattern. The practical prescription is to match the benchmark's factor exposure first, then construct the portfolio with a risk-aware scheme that avoids concentration in cyclicals or single names.

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