Two strategies can end a year with the same return and still be completely different experiences. One climbs steadily; the other loses a third of its value in March and spends the rest of the year recovering. The final number is identical. The path is not, and investors live through the path.
What drawdown measures
Drawdown is the percentage by which a value sits below the highest point it has reached so far. Maximum drawdown is the deepest of those dips over a period. It answers a blunt question: what was the worst loss someone could have suffered by buying at a peak?
Time under water
Depth is half the story. Time under water counts how long the value stayed below a previous peak. A 15% drawdown that recovers in a month is a different risk from one that takes two years to heal, because the second one tests patience, funding and confidence for much longer.
Why the order matters
- A loss of 50% needs a gain of 100% to recover, so deep drawdowns are disproportionately costly.
- Volatility treats rises and falls alike; drawdown looks only at the losses an investor actually feels.
- A strategy that is abandoned at the bottom of its worst drawdown never earns its long-run return.
In the Quant Lab, run the default market and then switch on the one-day shock. The total return barely changes, but the drawdown panel shows a much deeper and longer hole. That gap is exactly what a single return figure conceals.