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04 · Understand risk in amounts
What you’ll learn
Use simple numbers to understand price changes, drawdowns, and concentration.
Volatility describes prices moving up and down. A drawdown measures how far a value has fallen from a peak. Both describe aspects of risk, but neither tells us what happens next. Translating percentages into amounts can make a decline easier to understand.
Also look at concentration. If a portfolio totals 1,000 and 300 is in one asset, that asset’s position weight is 30%. Even a portfolio with many stocks may depend heavily on one industry. Diversification can reduce some risks but cannot guarantee against losses.
See it in an example
Suppose an amount falls from 100 to 80. That is a loss of 20 and a 20% drawdown. A subsequent 20% gain adds only 16, bringing it to 96. Returning to 100 requires a 25% gain because the starting value has changed. This arithmetic example is not a maximum-loss estimate.
Volatility
- Plain meaning
- Volatility describes how much prices or returns fluctuate over a period. Larger fluctuations generally mean higher volatility. The time window and calculation method matter when reading a quoted value.
- See it in an example
- Two assets both start at 100 and finish at 105. One changes a little each day; the other falls to 80, rises to 120, then retreats. Their final gain is the same, but the second path fluctuates much more.
- When would I use this?
- When studying a product, examine the path as well as the final return, then consider how those fluctuations could affect your plans.
- Common misconception
- Low past volatility does not rule out a future sharp fall. Volatility also does not cover every risk, such as difficulty selling a product.
Drawdown
- Plain meaning
- Drawdown measures a decline from an earlier peak. Maximum drawdown is the largest such peak-to-trough decline in the selected period. It differs from profit or loss measured from your purchase cost.
- See it in an example
- An investment rises from 100 to 120, then falls to 90. The drawdown from the peak is (120 − 90) ÷ 120 = 25%, while the loss from the initial 100 is 10%.
- When would I use this?
- When reading past performance, check the period, data frequency, and treatment of dividends or deposits and withdrawals before comparing figures.
- Common misconception
- Historical maximum drawdown is a past observation, not a promise about the most you could lose in the future.
Position weight
- Plain meaning
- Position weight is an asset’s share of a defined portfolio. First identify what is included, then divide the asset’s value by the portfolio’s total value.
- See it in an example
- In a portfolio worth 10,000, a stock worth 2,000 has a 20% weight. If another 5,000 in cash is included, the weight becomes about 13.3%.
- When would I use this?
- In your plan, define the funds included and the calculation basis. If borrowing is involved, distinguish gross assets from equity after liabilities.
- Common misconception
- The same 20% can mean different things with different denominators. The number alone does not establish suitability for a person.
Concentration
- Plain meaning
- Concentration describes dependence on a few assets or related risk sources. It includes a single position’s weight and shared exposure to sectors, regions, or business models.
- See it in an example
- Suppose you hold five stocks whose businesses all depend on the same raw material. A sharp rise in its price could increase costs across all five companies.
- When would I use this?
- List factors your researched investments share. Different names can conceal dependence on the same risks.
- Common misconception
- A large number of securities does not necessarily mean a wide range of risks. Look for what the holdings have in common.
Diversification
- Plain meaning
- Diversification spreads investments across assets and risk sources to reduce dependence on one holding. It can soften some individual setbacks, but cannot eliminate the risk of a broad market decline.
- See it in an example
- Suppose you own three funds and discover that their largest holdings are the same companies. Owning more funds may still leave substantial dependence on those companies.
- When would I use this?
- Compare funds’ main holdings, sectors, regions, and overlap. Understand their risk sources before assessing diversification.
- Common misconception
- Diversification does not guarantee against losses or require endlessly adding products. A very similar new product may barely change existing exposure.
Use what you just learned to answer a question
Choose the answer you think fits and write a short reason in your own words. Then submit to see the answer and explanation and check your understanding.
Try this for yourself
Choose a hypothetical amount and calculate what remains after a decline and what gain would restore it. Then consider which planned uses of the money a loss could affect.
05 · Quotes are not executions
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Learning and research support; no personal trade instructions or guaranteed returns. · Version 2026-09-13.1