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Warren Buffett tells most people to skip picking stocks and just buy an index fund — here's exactly why, and how.
Warren Buffett — arguably the greatest investor alive — tells most people to skip picking stocks and just buy an index fund. Here's exactly why, and how.
An index fund is a type of investment fund that simply tracks a market index — like the S&P 500. Instead of having a manager try to pick winning stocks, it buys everything in the index automatically and holds it.
If the S&P 500 goes up 12% this year, your S&P 500 index fund goes up ~12% (minus a tiny fee). If it drops 10%, yours drops ~10%. You get exactly what the market gives — no more, no less.
The Buffett Bet (real story): in 2007, Warren Buffett bet $1 million that a simple S&P 500 index fund would beat a portfolio of hedge funds over 10 years. He won. The index fund returned 125.8%. The hedge funds averaged 36.3% — and charged 10–20× more in fees.
| Actively Managed | Index Fund | |
|---|---|---|
| Management style | Human fund managers pick stocks | Tracks a market index automatically |
| Expense ratio (avg) | 0.50%–1.50% per year | 0.03%–0.20% per year |
| Performance | ~85% underperform index over 15 years | Matches the market by design |
| Tax efficiency | Lower — frequent trading creates events | Higher — minimal trading |
| Minimum investment | Varies ($1,000–$3,000 common) | $0–$1 (many brokers) |
| Transparency | Holdings disclosed quarterly | Holdings known daily |
An expense ratio is the annual fee deducted from your fund — automatically, invisibly. A 1% fee sounds small. Over decades, it's catastrophic.
Both can track the same index. The difference is mostly about how they trade. For most people, it doesn't matter much — just pick the one available in your account.
| ETF | Index Mutual Fund | |
|---|---|---|
| Trades like | A stock — any time market is open | End of day only (NAV) |
| Minimum investment | Price of 1 share (often $1 with fractional) | Often $1,000–$3,000 |
| Tax efficiency | Slightly higher | Slightly lower |
| Auto-invest | Depends on broker | Easy — set and forget |
| Expense ratios | Comparable — both can be very low | Comparable — both can be very low |
| Best for | Flexibility, brokerage accounts | Automatic investing in 401(k) |
Each index fund has a unique ticker symbol used to search and buy it on any brokerage platform. Not financial advice — these are widely discussed funds; always do your own research.
| Ticker | Fund | Tracks | Expense | Note |
|---|---|---|---|---|
| VOO | Vanguard S&P 500 ETF | S&P 500 (500 largest US companies) | 0.03% | Most popular index fund |
| VTI | Vanguard Total Stock Market ETF | Entire US stock market (~4,000 stocks) | 0.03% | Broadest US exposure |
| FZROX | Fidelity Zero Total Market | US total market | 0.00% | Zero expense ratio |
| FXAIX | Fidelity 500 Index Fund | S&P 500 | 0.015% | Great for Fidelity 401(k) |
| VXUS | Vanguard Total Intl Stock ETF | International stocks ex-US | 0.07% | Add for global diversification |
| BND | Vanguard Total Bond Market ETF | US bonds | 0.03% | Add bonds as you near retirement |
Don't overthink which fund to pick. VOO vs VTI vs FXAIX? The difference over 30 years is minimal. The decision that actually matters is starting. Pick any low-cost S&P 500 or total market fund, set up automatic contributions, and let compound interest do the work.
An index fund is a type of investment fund that tracks a market index — like the S&P 500 — automatically, without a human manager picking stocks. ETFs (Exchange-Traded Funds) are index funds that trade on a stock exchange like a regular stock throughout the day. Both give you instant diversification across hundreds of companies with very low fees (as low as 0.03% per year).
Index funds don't pay a fixed interest rate like a bank savings account or bond. Instead, they earn returns through stock price appreciation and dividends from the companies in the index. Historically, the S&P 500 has averaged ~10% annual return (7–8% after inflation), though this varies year to year and is never guaranteed.
The most widely held include VOO (Vanguard S&P 500 ETF), VTI (Vanguard Total Stock Market ETF), FXAIX (Fidelity 500 Index Fund), FZROX (Fidelity Zero Total Market Fund), SPY (SPDR S&P 500 ETF), IVV (iShares Core S&P 500 ETF), and VXUS (Vanguard Total International Stock ETF) for global exposure outside the US.
Both can track the exact same index and deliver nearly identical long-term returns. The key difference is how they trade: ETFs trade like stocks throughout the day, while index mutual funds are priced once at the end of the trading day. ETFs are slightly more tax-efficient in taxable accounts; mutual funds are easier to set up for automatic monthly investing.
You can start with as little as $1. Many brokers like Fidelity, Schwab, and Robinhood offer fractional shares. Fidelity's FZROX and FSKAX mutual funds have a $0 minimum investment. There is no ideal amount to start — starting small and consistently is far better than waiting.
US-listed ETFs like VOO, VTI, and SPY are generally only available to US residents through US brokers due to regulatory restrictions. International investors can access similar funds through UCITS-compliant ETFs listed in Europe or through their local brokerage's equivalent products.