1.11. Return, Volatility, and Risk
Lesson objective
Separate price fluctuation from permanent loss.
Return measures the change in value over a period. Volatility describes how much and how quickly prices fluctuate. Risk is broader and includes uncertainty, possible loss, business problems, debt, valuation, and other factors.
A stock may be volatile even when the business remains healthy, while another may appear stable before serious problems become visible. Analysis should not depend only on a price chart.
Investments with greater uncertainty generally need to offer greater potential return to be attractive, although that return may never materialize.
Return, volatility, and permanent loss are different
Return = (Ending value − Beginning value + distributions) ÷ Beginning value
Drawdown = (Current value − Previous peak) ÷ Previous peak
Drawdown math
A portfolio falls from $10,000 to $7,500: a 25% drawdown. To return from $7,500 to $10,000 it must then gain 33.3% because the recovery starts from a smaller base.
| Loss | Gain needed to recover | |---:|---:| | -10% | +11.1% | | -25% | +33.3% | | -50% | +100% |
Volatility is price movement; risk is broader and includes permanent loss, liquidity, leverage, fraud, and needing the money at the wrong time.
Essential terms
| Term | Practical meaning | |---|---| | Return | Gain or loss relative to the investment. | | Volatility | The magnitude of price fluctuations. | | Beta | An estimate of sensitivity to market movements; it does not summarize every risk. |
In Finzati
Finzati presents Beta, the 52-week range, trend, and fundamental metrics. None should be interpreted in isolation.
What you should remember
- Risk is not a single number.
- A temporary decline and a permanent loss are not the same.
Practice
Choose two companies with different betas and list risks that beta does not capture.