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Profitability and Investment Premia: What Fama–French’s ‘Quality’ Factors Mean for Investors
The Capital Asset Pricing Model (CAPM) assumes that a stock’s expected return is explained entirely by its sensitivity to the market portfolio: one factor, one beta. Yet in practice, the CAPM leaves much unexplained. Fama and French (1993) formalised these findings in their three-factor model, adding size (SMB) and value (HML) to the market factor.
Even then, further anomalies persisted. Portfolios sorted by profitability and investment intensity were not explained by the three-factor model. Fama and French (2015) expanded the framework to five factors, adding profitability (RMW—robust minus weak) and investment (CMA—conservative minus aggressive). This version explains the cross-section of returns more effectively, showing that much of what was previously attributed to value is better captured by profitability and investment.
For investors, RMW rewards exposure to firms with sustainable earnings, whilst CMA rewards avoiding those that pursue growth too aggressively. Profitability has been a consistent and defensive premium; investment more cyclical but valuable in filtering out overpriced growth.
Understanding Fund Manager Benchmarks: ARC, IA Sectors, and Beyond
When looking at the performance of discretionary fund managers (DFMs) or multi-asset funds, a natural question arises: ‘Compared to what?’ Benchmarks exist to provide that context, but not all benchmarks are created equal. Some measure how markets have performed, others reflect what peers are actually delivering, and each has strengths and weaknesses.
Understanding the Different Equity Indices
When we talk about investing in ‘the market’, we’re usually talking about an index. An index is a basket of securities designed to represent a particular slice of the market. Some are global, some are regional, and others zoom in on a country, sector, or company size.
You can’t invest in an index directly, but you can invest in mutual funds and ETFs that track them. Knowing which index you’re tracking matters because different providers slice the market in different ways.
The Size Premium Myth? Why Small May Need Friends
The so-called ‘size premium’, the idea that small companies reliably beat large ones, has always sounded intuitive. Smaller firms are riskier, less liquid, and harder to hold, so they should deliver higher returns. Yet the evidence is far from clear. Long-term data show bursts of small-cap outperformance, but these gains are patchy, fragile, and often vanish once you adjust for higher market betas. What really drives results is the company type: small-cap value and high-quality firms have consistently delivered, whilst small-cap growth has been persistently weak. The charts in this post make it plain. Size on its own is not a premium, but paired with value and profitability it remains a powerful portfolio building block.
Good financial decisions aren’t about predicting the future, they’re about following a sound process today.
In investing, outcomes are noisy. Short-term performance often reflects randomness, not skill. Yet fund managers continue to pitch five-year track records as if they prove anything. They don’t.
As Ken French puts it, a five-year chart ‘tells you nothing’. The real skill lies in filtering out the noise, evaluating strategy, incentives, costs, and behavioural fit.
Don’t chase what worked recently. Stick with what works reliably.