Ch3. Personal Finance — Stock Market & ETF Investing
Why Index ETFs?
For most individual investors, low-cost index ETFs are the optimal investment vehicle.
ETF advantages:
- Instant diversification across hundreds or thousands of holdings
- Ultra-low expense ratios (0.01–0.20%)
- Traded like stocks (flexible)
- No fund manager needed — track the market automatically
Index fund vs. active funds:
- Over 20 years, less than 10% of active funds beat their benchmark after fees
- High fees compound into dramatically lower wealth over time
Top Index ETFs
US Total Market
- VTI (Vanguard Total Stock Market ETF): 0.03% expense ratio, 4,000+ stocks
- VTI is the broadest US market exposure available
S&P 500
- VOO (Vanguard S&P 500 ETF): 0.03%, top 500 US companies
- IVV (iShares Core S&P 500): 0.03%, same exposure
International
- VEA (Vanguard FTSE Developed Markets): Europe, Japan, Australia
- VWO (Vanguard FTSE Emerging Markets): China, India, Brazil
Bonds
- BND (Vanguard Total Bond Market ETF): investment-grade US bonds
- Adds stability and reduces portfolio volatility
Portfolio Building Guide
Age-Based Stock/Bond Allocation
| Age | Stocks | Bonds/Cash |
|---|---|---|
| 20s | 85–95% | 5–15% |
| 30s | 75–85% | 15–25% |
| 40s | 65–75% | 25–35% |
| 50s+ | 55–65% | 35–45% |
Simple 3-Fund Portfolio
- US stocks: 60% (VTI or VOO)
- International stocks: 25% (VEA + VWO)
- Bonds: 15% (BND)
This simple allocation has outperformed the majority of actively managed funds over the past 20 years.
Dollar-Cost Averaging (DCA)
DCA: Invest a fixed amount at regular intervals regardless of price.
Advantages:
- Eliminates need to time the market
- Automatically buys more shares when prices are low
- Reduces emotional decision-making
Implementation:
- Set up automatic monthly contributions at your brokerage
- Invest right after each paycheck (automation removes willpower requirement)
- Maintain for minimum 3–5 years; ideal 10+ years
Chapter 4 Preview
Next: Home Buying vs. Renting — the real math of homeownership, mortgage fundamentals, and how to decide what’s right for your situation.
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