What is the low-vol anomaly?
The empirical observation that low-volatility stocks have historically delivered equal or higher risk-adjusted returns than high-volatility stocks. CAPM predicts the opposite; the data has falsified the prediction for decades.
The low-volatility anomaly is the documented pattern that portfolios of low-beta or low-realised-volatility stocks have historically delivered Sharpe ratios above the market and above high-volatility portfolios. The mechanism is debated: leverage aversion (some investors can't lever the market portfolio, so they buy high-beta stocks instead, bidding their price up), lottery-ticket preferences, and benchmark-relative performance pressure all contribute. invest-like's quality-tilted consensus naturally lands in the low-vol cohort because high-ROCE stable-margin businesses tend to have lower realised volatility.
Why it persists
The most cited explanation is leverage aversion (Frazzini and Pedersen 2014, Buffett's Alpha): investors who want higher returns but cannot use leverage buy high-beta stocks instead, bidding their prices up and dampening forward returns. The natural counterparty is the low-beta basket, which gets overlooked and underbid.
Behavioral explanations also contribute: lottery- ticket preferences (investors overpay for the low-probability moonshot), benchmark-relative pressure (active managers avoid low-beta names because missing index upside is career-threatening), and attention asymmetry (high-vol names get more financial-media coverage, which doesn't translate to higher forward returns).
How invest-like relates
The 7-framework consensus screen tilts toward quality-compounder businesses (high ROCE, durable margins, low debt). These names land disproportionately in the low-realised-volatility cohort, so the screen inherits a low-vol tilt mechanically. Frazzini-Pedersen identified Berkshire's historical alpha as substantially explained by a low-beta tilt against quality, which is the same factor combination the Buffett-Fit + Smith-Fit consensus emphasises.
Frequently asked questions
What is the low-vol anomaly?
The empirical pattern that low-volatility stocks deliver equal or higher risk-adjusted returns than high-volatility stocks, contradicting CAPM. Documented across decades and geographies.
Why does it work?
Leverage aversion is the most cited explanation: investors who can't use margin buy high-beta stocks instead, bidding them up and depressing forward returns on the basket.
Is invest-like a low-vol strategy?
Not explicitly, but the quality-and-value consensus tilts toward low-vol names mechanically. High-ROCE stable-margin compounders tend to have lower realised volatility, so the cohort inherits a low-vol footprint.
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