Passive investing has one founding statistic: nine out of ten asset managers can’t beat the market, net of fees, over five-year rolling periods. Repeated for fifty years, it built a nearly $50 trillion industry. But the statistic smuggles in a premise nobody audited — that the S&P 500’s methodology is itself unassailable, a neutral measure of “the market” rather than one particular construction with one particular history.
The paper supplies the missing audit. Cap-weighting was adopted for ease of calculation in an era of hand arithmetic; the S&P 500 inherited the shortcut; index funds turned the shortcut into a product; and scale turned the product into an unquestioned standard. Modern financial theory assumed the method correct because the industry already had.
The mechanics
What does the audit actually find? Speculative assumptions treated as settled; arbitrary constituent rules; scientific and statistical inconsistencies in the weighting itself; and — the paper’s sharpest phrase — a lack of true purpose: a method optimised for calculability, not for representing opportunity. Meanwhile the fee pressure that flowed from the founding statistic left roughly $100 trillion of active management academically defenseless — unable to explain why alpha eluded it, because the explanation lived in the ruler, not the runners.
| The received claim | What the audit finds |
|---|---|
| “The S&P 500 is a scientifically designed benchmark” | Cap-weighting was chosen for ease of hand calculation; the design was never re-derived from first principles |
| “Nine of ten managers can’t beat the market” | Nine of ten can’t beat one specific construction — with speculative assumptions and arbitrary rules |
| “Consistent alpha is impossible” | The method’s inconsistencies are structural — visible, and addressable by better construction |
An audit, not an attack
Read the index’s history the way an auditor would: as a sequence of decisions. Inclusions, exclusions, float adjustments, timing calls — each one made by a committee, each one moving money, all of it branded as “the market.” The paper’s point is not that the decisions were bad; it is that they were decisions, and decisions are active management.
Run the counterfactual: same universe, one portfolio built by a purely mechanical rule, the other by the committee index. They diverge — and the gap between them is active management that is neither priced nor benchmarked. You cannot fire the committee. But once you see the gap, you can at least measure it, and decide whether you want to own it.
What it means for portfolios
If the benchmark is a design accident, active management’s fee crisis is downstream of an unexamined assumption — and the response is not more stock-picking against the same ruler, but auditing the ruler. That is the position AlphaBlock builds from: treat benchmark construction itself as the alpha source, and let a better-designed index do the arguing.
- The “can’t beat the market” statistic assumes the S&P 500’s method is science; its history says convenience.
- The method’s flaws are structural — assumptions, arbitrary rules, statistical inconsistencies — not behavioural.
- Audit the ruler before blaming the measured; then beat it by design.
Pal, M. (2022). The S&P 500 Myth. SSRN 4170015.
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