Why Diversification Matters
Diversification means spreading your investments across different asset classes, sectors, and geographies so that a downturn in any single area does not devastate your entire portfolio. When tech stocks crashed 78% in 2000-2002, bonds gained 25%. When US stocks struggled in the 2000s, international stocks thrived. Diversification is insurance against being wrong about any single bet.
Asset Classes to Include
- US stocks (40-60%) — Core of growth. Use total market index fund (VTI) for broad exposure to 3,000+ companies. Includes large, mid, and small caps
- International stocks (15-25%) — Diversifies beyond the US economy. Use international index fund (VXUS). Includes developed (Europe, Japan) and emerging markets (China, India, Brazil)
- Bonds (10-30%) — Reduces volatility. US total bond index (BND). Bonds typically rise when stocks fall. Higher allocation for older investors or conservative temperaments
- Real estate (5-10%) — REITs (Real Estate Investment Trusts) like VNQ give exposure to real estate without buying property. Provides income and inflation protection
- Cash/short-term bonds (5-10%) — Emergency fund and near-term needs. Money market or high-yield savings at 4-5%
Sample Portfolios by Age
- Age 25-35 (aggressive) — 60% US stocks, 25% international stocks, 10% bonds, 5% REITs. High growth, can ride out volatility
- Age 35-50 (moderate) — 50% US stocks, 20% international, 20% bonds, 10% REITs. Balanced growth and stability
- Age 50-65 (conservative) — 35% US stocks, 15% international, 35% bonds, 10% REITs, 5% cash. Protecting accumulated wealth
- Retired (preservation) — 25% US stocks, 10% international, 45% bonds, 10% REITs, 10% cash. Income and capital preservation
Simplest approach: Buy a target-date fund (like Vanguard Target Retirement 2055). It holds all these asset classes and automatically adjusts as you age. One fund, fully diversified, zero effort.