Module 10 · Investing
Risk and return: swings, falls and time
What investment risk is, why a fall of 50% needs a gain of 100% to recover, how holding for longer changes the odds, and the difference between risk tolerance and risk capacity.
This lesson is not translated into your language yet, so it is shown in English.
This lesson is still locked
Pass the quiz in “Why invest at all? Saving, inflation and time” to unlock it.
Go to “Why invest at all? Saving, inflation and time”This module opens after you finish the previous one — or pass its module test if you already know it.
In this lesson
- Define risk and volatility, and explain why higher expected returns come with bigger swings
- Calculate the gain needed to recover from a loss
- Describe how longer holding periods have changed the range of past outcomes, and why history is no promise
- Tell risk tolerance (how you feel) from risk capacity (what you can afford to lose)
Milan, 71, tells his bank, “I love risk. Put everything in shares.” His pension covers part of his costs, and he will draw €12,000 a year from €60,000 of savings. Is “I love risk” enough to decide?
What risk is, and why returns come with it
is the chance that an outcome differs from what you expected, including losing money. Investments that can earn more are also those that can fall more, so risk and expected return rise together.
measures how widely an investment’s value swings up and down. For US shares, single years between 1928 and 2025 ranged from −44% (1931) to +53% (1954). Cash in a bank barely moves; shares jump around.
Falls hurt more than they look
A is the fall from a previous high to a later low. Losses and gains are not symmetrical, because the gain must come from a smaller amount.
Time changes the odds, but not the risk of a bad stretch
Looking at US shares (S&P 500 with dividends reinvested, 1928–2025, before inflation), the share of periods that ended in a loss shrank as the holding period grew:
| Holding period | Periods with a loss |
|---|---|
| 1 year | about 27% |
| 5 years | about 12% |
| 10 years | about 6% |
| 20 years | none |
That is one market’s history. Between 2000 and 2009, US shares earned about −1% a year. Japan’s Nikkei 225 took about 34 years, until February 2024, to regain its December 1989 peak. A long horizon helps, but it is not a guarantee.
Tolerance versus capacity
- is how much loss you can accept emotionally without panicking and selling.
- Risk capacity is how much loss your finances can absorb without harming your goals.
Capacity usually matters more. Milan may feel brave, but he needs 20% of his savings every year. A 40% fall, plus those withdrawals, could use up the money. When you are withdrawing, losses early on hurt most, because you sell at low prices to pay your bills. This is called sequence risk, and the retirement module returns to it.
Try it yourself
Check your understanding
10 questions. Get at least 8 right to unlock what comes next.