Investment Fundamentals
Core concepts every investor must understand before putting money at risk.
Why Invest
The Problem with Saving Alone
| Option | $10,000 over 30 years |
|---|---|
| Under mattress | $10,000 (loses purchasing power) |
| Savings account (1%) | $13,478 |
| Bonds (5%) | $43,219 |
| Stocks (10%) | $174,494 |
Inflation erodes cash. At 3% inflation, $10,000 today buys only $4,120 worth of goods in 30 years.
The Power of Compounding
Compound interest = earning returns on your returns.
Example: $10,000 at 10% annual return
- Year 1: $11,000 (+$1,000)
- Year 10: $25,937 (+$2,358 that year)
- Year 30: $174,494 (+$15,863 that year)
Time is the critical variable. Starting 10 years earlier matters more than investing more money later.
Risk and Return
The Fundamental Trade-off
Higher potential returns = higher risk.
| Investment | Historical Return | Risk Level | Volatility |
|---|---|---|---|
| Savings account | 0-2% | Very low | None |
| Government bonds | 3-5% | Low | Low |
| Corporate bonds | 4-7% | Low-Medium | Low-Medium |
| Stocks (large cap) | 8-12% | Medium | Medium-High |
| Stocks (small cap) | 10-14% | Higher | High |
| Real estate | 8-12% | Medium | Medium |
| Cryptocurrency | Highly variable | Very high | Extreme |
Types of Risk
| Risk | Description | Mitigation |
|---|---|---|
| Market risk | Overall market declines | Time, diversification |
| Inflation risk | Returns don't beat inflation | Growth investments |
| Interest rate risk | Bond values fall when rates rise | Shorter durations |
| Credit risk | Borrower defaults | Quality investments |
| Liquidity risk | Can't sell when needed | Keep emergency fund separate |
| Concentration risk | Too much in one investment | Diversification |
Risk Tolerance
Your ability and willingness to accept risk depends on:
Ability (Objective):
- Time horizon (longer = more risk capacity)
- Income stability
- Other financial resources
- Liquidity needs
Willingness (Subjective):
- How would you feel if portfolio dropped 30%?
- Would you sell? Hold? Buy more?
- Can you sleep at night?
Asset Classes
Stocks (Equities)
What: Ownership shares in companies Returns from: Price appreciation + dividends Risk: High volatility, can lose significant value Best for: Long-term growth (10+ year horizon)
Types:
| Type | Characteristics |
|---|---|
| Large cap | Big, stable companies (Apple, Microsoft) |
| Mid cap | Medium-sized, growth potential |
| Small cap | Smaller companies, higher risk/reward |
| Growth | Companies reinvesting for expansion |
| Value | Underpriced companies, often pay dividends |
| International | Non-US companies |
| Emerging markets | Developing countries, higher risk |
Bonds (Fixed Income)
What: Loans to governments or corporations Returns from: Interest payments + price changes Risk: Lower than stocks, but interest rate sensitive Best for: Income, stability, shorter time horizons
Types:
| Type | Risk | Yield |
|---|---|---|
| Treasury bonds | Lowest (US government) | Lowest |
| Municipal bonds | Low, tax advantages | Low-Medium |
| Investment-grade corporate | Low-Medium | Medium |
| High-yield (junk) | Higher | Higher |
Real Estate
What: Property ownership or REITs Returns from: Rental income + appreciation Risk: Illiquid, market-dependent Best for: Income, inflation hedge, diversification
Options:
- Direct ownership (rental property)
- REITs (real estate investment trusts)
- Real estate crowdfunding
Cash and Cash Equivalents
What: Savings, money markets, short-term CDs Returns from: Interest Risk: Very low, but inflation erodes value Best for: Emergency fund, short-term needs
Key Investment Concepts
Diversification
Don't put all eggs in one basket.
| Concentrated | Diversified |
|---|---|
| 100% in one stock | Hundreds of stocks across sectors |
| All domestic | US + international |
| Only stocks | Stocks + bonds + real estate |
Why it works: Different assets perform differently at different times. When one zigs, another may zag.
Asset Allocation
Your mix of stocks, bonds, and other assets.
| Profile | Stocks | Bonds | Risk Level |
|---|---|---|---|
| Aggressive | 90% | 10% | High |
| Moderate | 70% | 30% | Medium |
| Conservative | 40% | 60% | Lower |
| Very conservative | 20% | 80% | Low |
Rule of thumb: Stock allocation = 110 - your age (adjust for risk tolerance)
Dollar-Cost Averaging
Invest fixed amounts at regular intervals regardless of price.
Example: $500/month into an index fund
- Buy more shares when prices low
- Buy fewer shares when prices high
- Removes emotion and timing from equation
Rebalancing
Periodically return to target allocation.
Example: Target is 70/30 stocks/bonds
- Market rises, now 80/20
- Sell stocks, buy bonds to return to 70/30
Frequency: Annually or when allocation drifts 5%+ from target
Investment Vehicles
Individual Accounts
| Type | Tax Treatment |
|---|---|
| Taxable brokerage | Pay taxes on gains/dividends each year |
| Tax-advantaged (IRA, 401k) | Tax benefits (see chapter 3) |
Mutual Funds
- Professionally managed pool of investments
- Active management (manager picks stocks)
- Higher fees (expense ratios 0.5-1.5%)
- Most underperform index funds long-term
Index Funds
- Track a market index (S&P 500, total market)
- Passive management (no stock picking)
- Low fees (expense ratios 0.03-0.20%)
- Broad diversification
- Preferred choice for most investors
ETFs (Exchange-Traded Funds)
- Similar to index funds
- Trade like stocks throughout the day
- Very low fees
- More tax-efficient than mutual funds
Target-Date Funds
- All-in-one funds based on retirement year
- Automatically adjust allocation over time
- Simple, hands-off approach
- Good for beginners or hands-off investors
Fees and Costs
Why Fees Matter
| Fee | $100,000 over 30 years (7% return) |
|---|---|
| 0.04% | $745,180 |
| 0.50% | $647,262 |
| 1.00% | $574,349 |
| 2.00% | $432,194 |
A 1% difference in fees can cost hundreds of thousands over a lifetime.
Types of Fees
| Fee | What It Is | Typical Range |
|---|---|---|
| Expense ratio | Annual fund operating cost | 0.03% - 1.5% |
| Trading commission | Cost per trade | $0 - $10 |
| Advisory fee | Financial advisor cost | 0.5% - 1.5% |
| Load | Sales charge (mutual funds) | 0% - 5.75% |
| 12b-1 fee | Marketing fee (avoid) | 0.25% - 1% |
Rule: Keep total costs under 0.25% if possible.
Getting Started
Before You Invest
- Emergency fund first - 3-6 months expenses in savings
- Pay off high-interest debt - Credit cards, etc.
- Get employer 401k match - It's free money
- Then invest - After the above are handled
Starting Simple
The three-fund portfolio:
- US total stock market index fund (60-80%)
- International stock index fund (10-20%)
- US total bond market index fund (10-30%)
Adjust percentages based on age and risk tolerance.
Where to Open Accounts
Low-cost brokerages:
- Vanguard (inventor of index funds)
- Fidelity (excellent funds and service)
- Schwab (great all-around)
All offer no-commission trading and low-cost index funds.
Key Takeaways
- Start early - Time is your greatest asset
- Keep costs low - Fees compound against you
- Diversify broadly - Don't bet on single stocks
- Match risk to timeline - More time = more risk capacity
- Stay the course - Don't panic sell in downturns
- Simple works - Index funds beat most active managers
- Invest consistently - Regular contributions matter most