Začínáme s investováním
What Is Risk and How to Actually Measure It
Key takeaways
- For an investor the key risk is permanent loss of capital, not daily price fluctuations.
- Volatility measures how much prices swing — with a long horizon you bear it more easily.
- Drawdown is the decline from peak to trough; it shows how deep a portfolio can fall.
- Diversification and a long horizon reduce the risk of permanent loss, not necessarily volatility.
- How much risk you can bear depends on your horizon, temperament, and how you need the money.
- The biggest risk is often your own behaviour — selling in panic turns a temporary decline into a permanent loss.
The word "risk" sounds scary in investing, yet few people have it straight. The key distinction is: price fluctuating is one thing; permanently losing money is another. Once you understand this you stop fearing swings and start addressing what truly matters.
Volatility is not the same as loss
Share prices change every day — this is called volatility. But as long as you do not sell, a decline is only a temporary paper movement, not a real loss. A permanent loss occurs only when you sell below your purchase price, or when a company goes bankrupt. With a broad index of hundreds of companies, the risk of permanent loss over a long horizon is far lower than with a single stock.
Two metrics you will encounter
- Volatility — how much prices swing up and down. Higher volatility = a wilder ride, not necessarily a worse outcome.
- Drawdown — the decline from peak to trough. It tells you how deeply a portfolio has historically fallen (equity markets can drop 30–50% in crises) and how long recovery took.
What reduces risk
Two main levers: diversification (own hundreds of companies via an index instead of one — a single bankruptcy does not sink you) and a long horizon (the longer you hold, the more reliably drawdowns heal and growth shows up). These two things reduce mainly the risk of permanently losing, not necessarily day-to-day swings.
How much risk can you bear
Your risk tolerance depends on three things: your horizon (when you need the money), your temperament (how calmly you sleep during a drawdown), and your situation (do you have a stable income and a reserve?). Be honest with yourself — a portfolio that you cannot handle in a crisis and will sell is a bad portfolio for you, even if it would theoretically earn the most.
What to take away
Do not fear volatility — expect it and use it (in downturns you buy cheaply). Fear permanent loss, and that is caused most by bad behaviour, not the market itself. How deep historical drawdowns were and how the market has always recovered you will see in the scenarios in the growth projection.
FAQ
Is risk the same as price volatility?
No. Volatility is the daily price movement and as long as you do not sell it is only temporary. The real risk for an investor is permanent loss of capital — when you sell below your purchase price or a company goes bankrupt. These two must be kept separate.
What is a drawdown?
The decline in value from a peak to the subsequent trough, expressed as a percentage. It shows how deeply a portfolio has historically fallen and how long recovery took. Equity markets in crises commonly fell by 30 to 50% and then recovered.
How can I reduce risk?
Mainly through diversification (own hundreds of companies via an index rather than a single stock) and a long horizon (the longer you hold, the more reliably drawdowns heal). This reduces mainly the risk of permanent loss, not necessarily day-to-day volatility.
How do I know how much risk I can bear?
By your horizon (when you need the money), your temperament (how calmly you sleep during a drawdown), and your situation (stable income and a reserve). Be honest — a portfolio you cannot handle and will sell in panic is a bad one for you, even if it would theoretically earn the most.