Value investing and its traps

What value investing claims

Value investing buys businesses whose price is low relative to what they earn or own: earnings, operating profit (EBIT) or free cash flow relative to enterprise value, or book value relative to market value. Fama and French documented the value premium in the early 1990s, and it shows up across decades and countries.

The premium is not steady. In Fama and French's own update, the monthly return gap between cheap and expensive large stocks shrank from about 0.36 % in the first half of 1963–2019 to about 0.05 % in the second half. Arnott and co-authors measured a drawdown of roughly 55 % for the classic value factor from 2007 to mid-2020, mostly because cheap stocks became cheaper still.

Why a single ratio misleads

Book value misses intangible assets such as software, brands and research, so many profitable companies look expensive on price-to-book. Composite measures that average several yardsticks (earnings, EBIT, free cash flow, sales and shareholder yield) have been more robust than any single ratio. Our Value component uses such a composite, with separate variants for banks, REITs and utilities, whose accounts work differently.

The value trap

Many stocks are cheap for a good reason: earnings are about to fall, debt is rising, or the industry is shrinking. Signs that often come with a trap:

• Falling or negative free cash flow while the dividend stays high.
• Debt rising faster than operating profit (EBITDA).
• Weak accounting quality: reported profit far above cash flow.
• A Piotroski F-score of 3 or less: few of the nine accounting signals are improving.
• A price that keeps falling: weak 12-month trend.

What has worked better

Asness, Moskowitz and Pedersen found value and momentum to be negatively correlated (about −0.5 on average), so a blend of the two has been much steadier than either alone. Adding quality, meaning profitable and conservatively financed businesses, screens out many traps. That is why the Smart Score never uses value on its own: in the Balanced profile it carries 25 %, next to quality, trend, stability and dividend safety.

One more reminder: published factor returns tend to shrink after publication. McLean and Pontiff found that the returns of 97 published predictors fell by more than half (about 58 % on average) once the papers came out, so treat any backtest you see, ours included, with that discount. Our rules flag a possible value trap when an instrument sits in the cheapest fifth of its peers and its F-score is 3 or lower.

A practical checklist

• Look at several valuation measures, not one ratio.
• Check cash flow and debt before the dividend.
• Prefer cheap stocks whose fundamentals are stable or improving.
• Diversify across sectors: value screens cluster in banks, energy and materials.
• Be ready to wait: value can lag for a decade.