The Little Book of Value Investing Ch. 5: The Evidence, and the Decade Value Stopped Working
阅读中文版The academic case for the value premium, and the long stretch after 2007 when it vanished — plus what that ambiguity means for you.
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The Little Book of Value Investing Ch. 5: The Evidence, and the Decade Value Stopped Working
"A strategy working across many decades and a strategy working during the decades you happen to own it are two different propositions." — the theme of this chapter
Investment Context
The first four chapters explain why value investing is sensible. This one asks a sharper question: how strong is the evidence, and does it still hold?
This is not an academic footnote. Browne wrote in 2006, and the following fifteen years delivered the longest stretch of value underperformance on record. Anyone reading the book today needs to know that.
The Wall Street Translation
1. The Academic Evidence
Fama and French's 1992 work established the "value premium": across data back to 1926, low price-to-book stocks returned significantly more than high price-to-book stocks. That finding moved value investing from folk wisdom to academic consensus.
Two explanations for the premium compete, and the question remains unsettled:
| Explanation | Claim | Implication |
|---|---|---|
| Risk compensation (Fama) | Value stocks are genuinely riskier; the excess return pays for bearing it | The premium should persist, but is no free lunch |
| Behavioural error (Lakonishok et al.) | Investors systematically overrate growth and underrate dull companies | Once widely known, the premium may narrow or vanish |
2. The Fifteen Lost Years
From roughly 2007 to 2020 the US value premium essentially disappeared, with value stocks trailing growth badly and persistently. That span exceeded the patience of nearly every investor — and far exceeded the three-to-five-year horizon Browne recommends.
Three common explanations: intangible assets (brands, software, R&D) do not appear in book value, breaking price-to-book for modern businesses; sustained low interest rates disproportionately favoured growth companies whose cash flows sit far in the future; and arbitrage capital flowed in once the strategy was public.
The lesson is not that value investing is dead, but that a pattern established over many decades can fail to work for you across fifteen consecutive years.
3. Handling the Uncertainty Honestly
If the premium is risk compensation, it should persist. If it was a behavioural error now widely recognised, it may have narrowed permanently. Nobody knows which, and anyone claiming certainty is speaking beyond the evidence.
Actionable Trading Rules
- Do not treat a long-run statistic as a personal guarantee: Your horizon is finite and may land entirely inside a failure window. Adjust position size accordingly, not your confidence.
- Hold value and growth rather than choosing: If you cannot absorb fifteen lagging years, the robust choice is a broad index spanning both, which delivers the average of the two styles automatically.
- Write down your tolerance in advance: Before adding a value tilt, state explicitly how many consecutive lagging years you can accept. If the answer is under ten, do not tilt.
Relevance to a Retirement Portfolio
The lesson generalises well beyond value: any factor tilt — value, small-cap, momentum, low-volatility — can underperform for a very long time.
This matters most in the withdrawal phase, where you cannot simply wait for reversion: your horizon is finite and non-repeatable. That is the fundamental argument for a broad index core, which requires no particular style to work during the specific years you happen to need it.