Passive investing.
The case for owning the market.

The SPIVA evidence

SPIVA (S&P Indices Versus Active) is the standard scorecard tracking active manager performance vs benchmarks across categories. Across rolling 15-year windows, the majority of active US equity managers in every major category have underperformed their benchmark verify×DON'T TRUST, VERIFYClaim: SPIVA reports show majority of US active managers underperform benchmarks over 15-year windows.Verify at: SPIVA reports, S&P Global ↗SPIVA is published twice yearly. The pattern is consistent across categories and replicates internationally..

The reasons compound: fees, transaction costs, tax drag from turnover, and the mathematical reality that the "average active manager" must by construction earn the market return minus fees, since active and passive together are the market. Detail at Index Funds.

Why most individual stocks lose

Hendrik Bessembinder's research on US stock returns from 1926 to 2019 found that just 4% of stocks accounted for the entire net-market gain over T-bills verify×DON'T TRUST, VERIFYClaim: Bessembinder (2018) found ~4% of US stocks accounted for all net wealth created above T-bills since 1926.Verify at: Bessembinder, "Do Stocks Outperform Treasury Bills?" SSRN ↗The other 96% collectively earned approximately the T-bill return or worse. The result has been replicated internationally.. The other 96% collectively earned approximately the T-bill return or worse. Picking individual stocks is therefore a bet that you can identify the few winners. The base rates suggest most pickers cannot.

Owning the index guarantees you own the few winners. You also own the many losers, but the winners' compounding dominates the dispersion mathematically. This is the structural argument for total-market investing rather than individual-stock or sector picking.

Why the market is hard to beat

Eugene Fama's Efficient Market Hypothesis (1970) argued that prices reflect all available public information; you cannot consistently beat the market using public information because that information is already priced in verify×DON'T TRUST, VERIFYClaim: Fama (1970) formalized the Efficient Market Hypothesis in three forms (weak, semi-strong, strong).Verify at: Fama (1970) JF 25(2) ↗Fama won the Nobel in 2013 partly for this work. The strong form is contradicted by insider trading; weak and semi-strong are broadly supported.. The Grossman-Stiglitz paradoxGrossman-Stiglitz paradoxThe 1980 finding that markets cannot be perfectly efficient: if prices reflected all information, no one would research stocks, and prices would stop reflecting information. Markets settle at a noisy equilibrium where most active managers cannot beat the index after fees. refines this: markets must be slightly inefficient or no one would have an incentive to research. The arbitragearbitrageProfiting from price differences in the same asset across different markets, often by buying low in one place and selling high in another. opportunities are real but small and short-lived, available mostly to professionals with information edges that retail investors do not have.

The practical takeaway: even if some inefficiency exists, capturing it requires resources, information, and discipline most retail investors do not possess. Owning the market sidesteps the question entirely.

The Bogleheads philosophy

John Bogle's founding insight at Vanguard: investors as a group earn the market return minus costs. Therefore minimize costs. The Bogleheads community formalizes this into a few principles: develop a workable plan, invest early and often, never bear too much or too little risk, diversify, never try to time the market, use index funds when possible, keep costs low, minimize taxes, invest with simplicity, stay the course.

None of these are clever. All of them are correct. Detail at Index Funds sections 7 to 9.

What this changes for tomorrow

• If you're paying an advisor 1%+ AUM for active management, the SPIVA data suggests you're paying for underperformance. The fee compounds against you.
• If you have time and energy for stock picking, the base rate of underperformance suggests it's likely an entertaining hobby rather than a wealth strategy.
• The passive default is a small set of low-cost broad index funds. Detail at Choosing Funds.
• Behavioral discipline matters more than fund selection. Most investors who underperform indices do so because they sell during drawdowns and buy at peaks. Detail at Behavioral Finance.

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