Why index funds quietly won

An index fund is a mutual fund or ETF that tracks a specific market index (like the S&P 500) by holding the same stocks in the same proportions. Instead of trying to pick winners, it holds everything in the index. This makes them low-cost, tax-efficient, and historically very hard for active fund managers to beat over long periods.

Over long periods, the data strongly favors index funds for most investors. Studies repeatedly show 80-90% of active fund managers underperform their benchmark over 10-15 year periods, largely due to fees. The fees on index funds are typically 0.03-0.20% per year vs. 0.50-1.50% for active funds — that gap compounds enormously over decades.

Both can be index funds. ETFs (exchange-traded funds) trade like stocks throughout the day and typically have lower minimums. Mutual funds price once daily after market close and may have minimums like $1,000-$3,000. For long-term investors, the practical difference is minor — both can hold the same underlying index.

An expense ratio is the annual fee a fund charges, expressed as a percentage of assets. Top broad-market index funds like VTI or SCHB charge 0.03-0.04% — meaning $3-$4 per year on a $10,000 investment. Anything above 0.20% for a basic index fund is typically considered expensive in 2026.

Both are reasonable; the difference is small. S&P 500 funds hold the 500 largest U.S. companies; total market funds add another ~3,000 mid- and small-cap stocks. The S&P 500 dominates total market performance because of its market-cap weighting, so the two tend to perform within a fraction of a percent of each other annually.