
An index fund is a fund that tracks a market index (like the S&P 500) by buying all the stocks in that index.
The S&P 500:
500 largest US publicly traded companies
Historical average annual return: ~10% (7% after inflation)
Includes Apple, Microsoft, Amazon, Google, etc.
Why index funds beat most active managers:
Over 15 years, ~90% of actively managed funds underperform their benchmark index
Active funds charge 0.5–2% per year in fees
Index funds charge 0.03–0.20% per year
That 1%+ fee difference compounds devastatingly over decades
Expense ratio impact:
$100,000 invested for 30 years at 8%:
0.05% fee (index fund) → ~$992,000
1.0% fee (active fund) → ~$761,000
Difference: $231,000 in fees!
The Bogle philosophy (Vanguard founder): "Don't look for the needle in the haystack. Buy the haystack."
Top index funds: Vanguard Total Stock Market (VTI), Fidelity Zero Total Market (FZROX), iShares Core S&P 500 (IVV)
Reference:
TaskLoco™ — The Sticky Note GOAT