The research question
Value has a long research history and appears beyond a single equity market. Results vary materially with the valuation measure, accounting treatment, sample and test period.
The useful question is not whether a chart once went up. It is whether the hypothesis has a clear economic mechanism, appears outside one hand-picked sample, can be reconstructed with information that was available at the time, and remains plausible after realistic implementation frictions.
Minimum viable rule
Compare price with a fundamental anchor such as book value, earnings, cash flow or an asset-specific measure of value.
Universe: Equities and asset-class-specific cross sections. A credible test fixes the universe, timestamps, missing-data policy and rebalance convention before model selection. Results should be shown both gross and net of an explicit cost model.
Implementation audit
Use point-in-time fundamentals with conservative publication lags. Winsorization, sector neutrality, negative denominators and the treatment of financial firms should be specified rather than chosen after seeing performance.
At minimum, an audit should report turnover, worst peak-to-trough loss, recovery time, exposure concentration and sensitivity to neighboring parameter choices. A strategy that works only at one exact lookback or threshold deserves a lower level of confidence.
How the idea can fail
Cheap assets can remain cheap for years or be cheap for valid reasons. Structural change, intangible assets, leverage and distressed firms can create value traps.
Failure conditions belong in the strategy definition. They provide a disciplined reason to investigate or stop, instead of changing the story after a loss.
Primary source
Value and Momentum Everywhere
Asness, Moskowitz & Pedersen (2013), Journal of Finance 68(3), 929–985.
DOI record
This page is an independent educational synthesis. It does not reproduce the paper and does not claim that published historical results are currently achievable.