Vanguard addresses common myths about index fund investing, showing that indexing’s rise has not distorted markets or reduced price discovery. The report highlights how index funds continue to democratize investing through diversification, low costs, and transparency—while empirical evidence dispels concerns about concentration, volatility, and market inefficiency.
Setting the record straight: The truths about index fund investing
Vanguard
James Rowley Jr., Stephen Lawrence, Ollie Ryder-Green
Research
16 Pages
Key Takeaways
Limited market impact: Index funds account for just ~1% of total U.S. equity trading volume, refuting claims they drive market prices.
Stable volatility: Market volatility remains uncorrelated with index fund growth; macroeconomic factors are the true drivers.
Dispersion intact: Stock-level dispersion has held near 70% for three decades, leaving ample room for active management success.
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