What is a market?
A financial market brings buyers and sellers together to trade investments. Prices change as people respond to business results, economic conditions, and expectations about the future.
Investing means putting money into assets with the hope of receiving income, growth, or both. You can also lose money. Your goal and the amount of time before you need the money help determine which risks make sense.
Three building blocks
| Investment | Plain-language meaning | How you might earn money | Main risk |
|---|---|---|---|
| Stock | A small ownership share in a company | The share price rises, or the company pays dividends | The price can fall; dividends can change or stop |
| Bond | A loan you make to a government or company | Interest payments and repayment according to the bond’s terms | The borrower might fail to pay; selling early can produce a loss |
| ETF | A fund whose shares trade on an exchange; many hold a collection of investments | Changes in share price and distributions from its holdings | Its underlying investments can lose value |
Stocks represent ownership; bonds represent lending. A bond’s promise to repay depends on the issuer’s ability to meet its obligations.
An ETF can hold stocks, bonds, or other assets. Some spread money across many companies; others focus narrowly on one industry or even one stock. “ETF” does not automatically mean diversified or low risk.
Accounts and investments
Think of an account as a container and investments as its contents.
- A taxable brokerage account can hold investments such as stocks and ETFs.
- An IRA is an account with retirement-related tax rules.
- A 401(k) is an employer-sponsored retirement plan with investment choices.
The account affects rules, services, and tax treatment. The investments determine much of the risk and potential return. Opening or funding an account does not necessarily mean you have selected investments; check where your money is actually held.
Build a portfolio with a purpose
Your portfolio is the collection of investments you own.
Asset allocation means dividing money among categories such as stocks, bonds, and cash. Diversification means spreading exposure across different investments, companies, industries, and potentially countries.
Owning several funds may still leave you concentrated if they hold many of the same companies. Diversification reduces dependence on any single holding, but it cannot guarantee a profit or prevent losses across the market.
A simulated $1,000 portfolio
Jordan has emergency savings elsewhere and creates this practice portfolio for a long-term goal:
| Holding | Starting amount | Hypothetical change | Ending amount |
|---|---|---|---|
| Broad stock ETF | $600 | −10% | $540 |
| Bond ETF | $300 | +2% | $306 |
| Cash, assuming no interest | $100 | 0% | $100 |
| Total | $1,000 | −5.4% overall | $946 |
The calculation is $540 + $306 + $100 = $946, a $54 decline.
The bond ETF’s gain softened the stock loss in this example. In another period, both could fall. These are invented outcomes, before taxes and any separately charged account fees. This allocation is a teaching example, not a suggested portfolio.
Costs and risks to understand
A fund’s expense ratio describes its annual operating expenses as a percentage of fund assets. At a constant $1,000 balance, a hypothetical 0.10% expense ratio represents approximately $1 a year; 1.00% represents approximately $10. Fund expenses reduce the value available to investors.
Also check trading charges, account fees, and advisory fees. Small recurring costs can meaningfully reduce what remains invested over time.
- Market risk: Prices can fall when you need the money.
- Concentration risk: Too much depends on one company or sector.
- Bond risks: Borrowers can default, and rising interest rates generally push existing fixed-rate bond prices down.
- Inflation risk: Your money may buy less even if its dollar value increases.
Stocks, bonds, and investment funds are not FDIC-insured deposits, even when purchased through a bank.
Practice before using real money
Write down a goal, when you expect to use the money, and how a temporary loss would affect that goal. Then inspect a sample ETF’s holdings and expenses. Explain what you would own and what could go wrong.
Check your understanding
- Is an IRA an investment or an account?
- Does owning three technology ETFs necessarily provide broad diversification?
- Approximately how much does a 0.25% annual expense ratio represent on a constant $2,000 balance?
- Can a diversified portfolio lose money?
Reveal the answers
- An account. Its investments must be selected separately.
- No. Their holdings may overlap heavily.
- $5 annually: $2,000 × 0.0025.
- Yes. Diversification helps manage risk; it does not eliminate it.