Value Factor

The Value Factor is the historical tendency for "cheap" stocks (companies with low prices relative to their fundamentals like book value or earnings) to outperform "expensive" growth stocks over the long term.

It is a core pillar of quantitative finance, originally popularized by the Fama-French Factor Models. Value is typically defined mathematically using metrics such as Price-to-Book (P/B), Price-to-Earnings (P/E), or Price-to-Cash Flow (P/CF).

Academic literature suggests two main reasons for the value premium: Risk and Behavior. The risk-based explanation posits that value companies are inherently riskier or distressed, so investors demand a higher expected return to hold them. The behavioral explanation suggests that investors irrationally overpay for "glamour" growth stocks and unfairly punish "boring" companies, leading to mispricings that eventually correct.

When combined with the Size factor (creating Small-Cap Value), the historical excess return has been even stronger. This is why many advanced asset allocation models, such as the Larry Portfolio and the Golden Butterfly, use significant allocations to Small-Cap Value ETFs to boost long-term growth.