What a stock really is
A stock represents a slice of ownership in a company. When you buy a share, you’re buying a claim on that company’s future profits and assets. Your return comes from two main sources:
- Price changes: if the market values the company more highly over time, the share price rises.
- Dividends: some companies share part of their profits with shareholders as cash payments.
Stock prices move based on earnings, growth expectations, interest rates, competition, and investor sentiment. This makes them more volatile in the short term, but historically they’ve offered higher long-term return potential than many other assets.
What a bond really is
A bond is a loan. When you buy a bond, you’re lending money to a government, municipality, or company. In exchange, they promise to pay you interest and return your principal at maturity.
Key components of a bond:
- Face value (par): the amount that will be repaid at maturity.
- Coupon rate: the interest rate paid on the face value.
- Maturity date: when the principal is scheduled to be repaid.
Bond returns come from interest payments and changes in price. Prices move as interest rates and credit risk change. Bonds are often used for income and stability, but they are not risk-free.
Return and risk: stocks vs bonds
Over long periods, stocks have historically delivered higher average returns than bonds, but with larger and more frequent swings. Bonds typically offer lower expected returns but smoother ride.
A simplified way to think about it:
- Stocks: higher expected return, higher volatility, more sensitivity to economic growth.
- Bonds: lower expected return, lower volatility, more sensitivity to interest rates.
Volatility is often measured by standard deviation of returns. If a stock fund has an annual return standard deviation of 15% and a bond fund has 5%, the stock fund’s returns will typically swing more widely around their average.
Helpful tools:
How interest rates affect bonds
Bond prices and interest rates move in opposite directions. When new bonds are issued at higher rates, existing bonds with lower coupons become less attractive, so their prices fall. When rates drop, existing higher-coupon bonds become more attractive, and their prices rise.
A simple relationship:
Approximate Price Sensitivity (Duration):
Price Change ≈ −Duration × Rate Change
Example: a bond fund with duration of 6 years and a 1% (0.01) rise in interest rates:
Price Change ≈ −6 × 0.01 = −0.06 → about a 6% price drop
Duration doesn’t predict perfectly, but it gives a useful estimate of how sensitive a bond or bond fund is to rate changes.
Income vs growth: how stocks and bonds pay you
Stocks and bonds can both pay you, but in different ways:
- Stocks: dividends (if paid) + price appreciation.
- Bonds: interest payments (coupons) + price changes.
If you’re focused on predictable income, bonds and dividend-focused stock strategies may play a larger role. If you’re focused on long-term growth, broad stock exposure often becomes the core.
Example of annual income from a bond:
Annual Interest = Face Value × Coupon Rate
If a bond has a face value of $10,000 and a 4% coupon:
Annual Interest = 10,000 × 0.04 = $400
How stocks and bonds work together in a portfolio
Most long-term portfolios use both stocks and bonds. The mix between them—your asset allocation—shapes your experience more than any single investment choice.
Example allocations:
- Aggressive: 90% stocks, 10% bonds
- Balanced: 60% stocks, 40% bonds
- Conservative: 30% stocks, 70% bonds
The goal isn’t to find a “perfect” mix, but one you can realistically stick with through both good and bad markets. Stocks drive growth; bonds help smooth the ride and provide ballast when stock markets are turbulent.
Helpful tools:
Frequently asked questions about stocks and bonds
1. Are bonds always safer than stocks?
Bonds are often less volatile than stocks, but “safer” depends on the type of bond and your time horizon. High-yield or long-duration bonds can be quite sensitive to economic stress and interest rate changes.
2. Can stocks be used for income?
Yes. Dividend-paying stocks and equity income funds can provide cash flow, though dividends are not guaranteed and stock prices can still fluctuate significantly.
3. Do I need both stocks and bonds if I’m young?
Many younger investors lean heavily toward stocks because of their long time horizon, but some bond exposure can still help manage volatility and provide psychological comfort during downturns.
4. What happens to bonds when inflation is high?
High inflation can erode the real value of fixed interest payments. If inflation rises faster than expected, bond prices may fall as investors demand higher yields to compensate.
5. Are government bonds risk-free?
Government bonds from stable countries are often considered low credit risk, but they still carry interest rate and inflation risk. “Low risk” doesn’t mean “no risk.”
6. How do I decide my stock/bond mix?
Start with your time horizon and risk tolerance. Longer horizons and higher tolerance often support more stocks; shorter horizons or lower tolerance often call for more bonds. Tools that model scenarios and volatility can help you choose a mix that feels realistic.
Related MyGenFinance tools for stocks and bonds
These tools help you move from theory to your actual numbers, so you can see how different stock and bond mixes might behave over time.