The Value Factor

intermediate7 min read

Buying cheap and selling dear, systematically. Why it works, and why it can hurt for years.

The value factor is the systematic version of “buy cheap”: tilting toward stocks that are inexpensive relative to fundamentals (low price-to-earnings, price-to-book, etc.) and away from expensive ones. It’s one of the oldest and most-studied factors.

Value works for a behavioural reason: investors overpay for exciting, popular stories and overly punish boring, troubled ones, so cheap stocks tend to be priced too pessimistically and revert upward over time. But value carries a brutal, defining trait every investor must accept: it can underperform for painfully long stretches — years at a time. During growth-led manias (e.g. tech booms), cheap stocks lag badly and value looks “broken,” tempting investors to abandon it right before it works again. This is the crucial lesson: a real factor’s very persistence depends on it being hard to hold — if value were comfortable, everyone would do it and the edge would vanish. The pain is the price of admission. So value rewards patience and discipline, and punishes those who chase it after a hot run or dump it during a long drought.

What it is — buy cheap (low P/E, P/B, etc.), avoid expensive; harvested across the cheapest stocks as a group.
Why it works — behavioural overreaction: glamour stocks get overpriced, unloved ones underpriced, then revert.
The catch — value can lag for years (especially in growth manias); the discomfort is what keeps the edge alive.
The discipline — patience; don’t abandon it during droughts or chase it after a hot run.

ExampleThrough the late-2010s growth boom, value strategies lagged glamorous tech for years — many declared value “dead.” Then conditions shifted and value sharply outperformed. Investors who capitulated during the drought missed the rebound; those who held the unloved cheap stocks through the discomfort were eventually rewarded. The pain and the payoff were two sides of the same factor.

Key takeawayThe value factor systematically buys cheap stocks (low P/E, P/B) and avoids expensive ones, working because investors overprice glamour and underprice the unloved. Its defining trait: it can underperform for years, and that discomfort is exactly what keeps the edge from being arbitraged away. It demands patience.

FAQs

Is value investing dead given how long it has lagged at times?

Long droughts are *characteristic* of value, not proof it’s dead — it has revived repeatedly after being declared finished. That said, factors can decay (Module 1), so combine value with other factors and a real rationale rather than betting everything on it. The honest stance: expect long dry spells, and don’t abandon (or over-concentrate in) the factor based on recent performance.