Human-Driven Markets Model
Separate pragmatic value from prices distorted by emotion and trend-following
- Difficulty
- Advanced
- Time to result
- ~ongoing to results
- Steps
- 5
- Confidence
- 92%
The Human-Driven Markets Model treats market prices as outputs of human decisions rather than continuously accurate measurements of fundamental value. Investors first form a pragmatic assessment using business quality, cash flows, risks, and other relevant evidence. They then compare that assessment with the prevailing narrative and ask whether fear, enthusiasm, social imitation, or career pressure is causing prices to overshoot. A valuation gap is not automatically an opportunity: the investor must test the thesis, specify evidence that would disprove it, and ensure the position can survive an extended divergence. The crucial rule is not to dilute a coherent strategy merely because a fashionable trade is temporarily winning. The output is a decision grounded in evidence while remaining realistic about human behavior and timing risk.
Origin
Greg Fleming illustrated the model with value investor Lou Sanders refusing to chase internet stocks during the dot-com bubble despite severe relative underperformance.
Core principles
- 01Markets are produced by people rather than perfect calculation
- 02Human emotion can push prices beyond pragmatic value
- 03A sound thesis may underperform before a bubble breaks
- 04Trend pressure is not sufficient reason to abandon disciplined analysis
How to run it
- 1
Build a Pragmatic Valuation
Estimate what the asset should be worth using relevant operating, financial, and competitive evidence. Document assumptions before examining how popular the trade has become.
Pro tip Use ranges rather than a single falsely precise value.
Watch out A valuation built to justify the current price is not independent analysis.
- 2
Diagnose the Human Narrative
Identify the beliefs, emotions, and incentives attracting market participants. Determine whether buyers are underwriting value or extrapolating a trend.
Pro tip Listen for claims that traditional analytical constraints no longer matter.
Watch out Popularity alone does not prove a bubble.
- 3
Measure the Overshoot
Compare price and implied expectations with the pragmatic analysis. Examine what must occur for the market price to be justified.
Pro tip Translate the price into required growth, margins, or market share.
Watch out Markets can remain detached from valuation longer than expected.
- 4
Protect the Thesis from Social Pressure
Do not alter a coherent strategy solely because peers or benchmarks temporarily reward the fashionable position. Revisit the evidence rather than reacting to embarrassment.
Pro tip Separate thesis review from performance review.
Watch out Stubbornness is not discipline; valid contradictory evidence must still change the thesis.
- 5
Define Invalidation and Patience
Specify what would prove the analysis wrong and ensure the position can survive until the gap potentially closes. Act only within those risk limits.
Pro tip Set exposure so that waiting does not force an untimely exit.
Watch out Being fundamentally right can still produce losses if leverage or liquidity makes patience impossible.
In the wild
While Sanford Bernstein’s value strategy was being crushed on a relative basis, Fleming suggested adding some internet exposure. CEO Lou Sanders replied that it was a bubble and would pop, refusing to deviate from the firm’s discipline. The subsequent collapse vindicated the analysis, although the strategy had first endured substantial pressure.
→ The investor preserved strategic discipline and was ultimately proved right when the bubble burst.
Common mistakes
Assuming Price Equals Truth
Prices reflect human emotion and incentives as well as information, so they can overshoot pragmatic value.
Chasing Relative Performance
Adding fashionable assets simply because disciplined holdings are lagging can abandon the strategy near the point of reversal.
Confusing Discipline with Infallibility
A strong conviction still requires explicit invalidation criteria and ongoing evidence review.
Is it for you?
Best for
It is best for disciplined investors evaluating bubbles, crowded trades, and periods of severe relative underperformance.
Not ideal for
It is not ideal for short-horizon traders whose strategy intentionally follows price momentum.
From the transcript
“markets, like everything, are driven by people”
“markets are also tied to human beings who get emotional, who get caught up in trends”
“they're not always going to be necessarily where a pragmatic analysis would say they should be.”
From the episode
Greg Fleming on Shaping Wall Street (Podcast)
Greg Fleming