What is Risk? Why Investments Can Lose Money

What you'll learn

• What risk means in plain words
• Why investments can lose money sometimes
• How risk and return are linked
• Simple ways to measure risk with chances
• How to use the idea of expected return
• How to lower risk with time and mix
• How to make choices that fit your goals

Concept explanation

Risk is the chance that things do not go as planned. In money, risk means your savings can go down. It also means your gains might be smaller than you hoped. Risk is not always bad. It is the reason you can earn more than a simple bank rate.

Return is what you get from an investment. It can be money you earn, like interest or profit. It can also be how much the value goes up. Higher return often comes with higher risk.

Think of crossing a stream on rocks. A wide jump can get you across faster. But you could slip. A small step is safer, but slower. Investing is like choosing your steps. Big jumps can give big rewards. They can also lead to falls.

There are many kinds of risk. The market can swing up and down. A company can have bad news. Prices in stores can rise due to inflation. You might need cash fast and cannot sell something easily. All of these are risk.

Why it matters

Money choices always include risk. Even “safe” choices have some risk. A savings account can lose to inflation. That means your money buys less later.

Knowing risk helps you match your plan to your life. If you need money next month, you should not pick very risky things. If you are saving for college in five years, you can take some risk, but still be careful. If you are saving for retirement in 40 years, you can handle more ups and downs.

Risk also helps explain why returns differ. A stock can earn more than a bank account over time. But the ride is bumpy. If you know this, you worry less when prices dip. You can plan for bumps and stay on track.

Calculation method

We can keep the math simple. We use chances and outcomes. Then we find the average result we might expect.

Step 1: List possible outcomes.

• Example: A stock could go up 10% or down 5% in one year.

Step 2: Estimate the chance for each outcome. These are probabilities. They add up to 100%.

• Example: Up 10% with a 60% chance. Down 5% with a 40% chance.

Step 3: Find expected return. Multiply each outcome by its chance. Then add the parts.

Example math:

This 4% is the average you might expect over many years. It is not a promise. In one year, you will get either +10% or -5%. Not 4%.

Step 4: Think about risk size. How far can results be from the expected return? That spread is risk. Bigger swings mean more risk.

A coin flip example:

• Win $10 with a 50$8 with a 50% chance.

The game has a positive expected value of $1. But you still might lose$8. That risk might matter if you need lunch money today.

Case study

Maya wants to buy a game in one year. The game costs $60 today. She has$55. She can choose one of three options.

Option A: Keep cash at home.

• Return: 0%
• Risk: Low theft risk, but price of the game could rise.

Option B: Put money in a savings account at 3% interest.

• Return: About $55 × 3$1.65
• End balance: $56.65
• Risk: Very low, but inflation could rise faster than 3%.

Option C: Buy a stock fund.

• Possible outcomes in one year:
  • Up 12% with 50% chance
  • Up 0% with 20% chance
  • Down 10% with 30% chance

Compute expected return for Option C.

Expected return is 3%. That sounds like the savings account. But the path is very different.

• Best case: $55 × 1.12 =$61.60 (game bought!)
• Middle case: $55 × 1.00 =$55.00 (still short)
• Worst case: $55 × 0.90 =$49.50 (farther away)

Now think about needs and risk.

• Maya needs the money in one year.
• She cannot risk being short.
• Option B is safer for her goal.

If Maya were saving for a laptop in five years, the choice might change. She would have more time to ride out drops. Option C could be fine then.

Practical applications

Match time to risk.

• Need money soon? Choose lower risk options, like savings accounts or short-term funds.
• Long-term goals? You can add some stocks for higher growth.

Build a mix (diversify).

• Do not put all your money in one stock.
• Mix types: cash, bonds, and stocks.
• If one drops, others may help.

Plan for emergencies.

• Keep some cash for surprise costs.
• This lets you avoid selling investments during a drop.

Use dollar-cost averaging.

• Invest a set amount each month.
• You buy more shares when prices are low.
• You buy fewer when prices are high.
• This smooths out risk over time.

Set risk rules.

• Ask, How much loss can I handle this year?
• Make a plan before you invest.
• Example: I will keep 30% in savings and 70% in a stock fund.

Review and adjust.

• Once or twice a year, check your mix.
• If stocks grew too much, move some back to safer spots.
• Stay close to your risk plan.

Use simple math.

• List outcomes.
• Set chances.
• Compute expected return.
• Ask if the worst case is OK for you.

Quiz yourself.

• If your $100 could become$90 next year, would you be OK?
• If not, lower risk until the answer is yes.

Common misconceptions

Summary

Glossary

Risk: The chance that results are different than planned, including a loss.

Return: The money you earn or the change in value of an investment.

Volatility: How much prices move up and down over time.

Diversification: Spreading money across different things to lower risk.

Probability: The chance that something will happen, shown as a percent or decimal.

Expected value: The average result you might get, based on chances and outcomes.

Time horizon: How long until you need the money for your goal.

Inflation: A rise in prices over time that reduces buying power.

Liquidity: How fast you can turn something into cash without a big loss.