Drawdown Management¶

Why It Matters¶

Losses and gains are asymmetric: a 50% loss requires a 100% gain to break even. Large drawdowns can be psychologically or financially catastrophic, causing panic selling at the worst time. Drawdown management prevents the deep holes that are hardest to climb out of and keeps you in the game during bad periods.

The Key Move¶

Track the current value versus the highest previous value (the high-water mark). Calculate drawdown percentage. Set a maximum acceptable drawdown threshold (e.g., 20%). If drawdown exceeds the threshold, implement defensive actions: reduce position sizes, shift to less volatile assets, raise cash, or halt new risk-taking. Resume normal allocations only after recovery or reassessment. This creates an automatic circuit-breaker.

Classic Application¶

Hedge fund risk management. Many funds have a 20-25% drawdown limit. If losses reach this level, they de-risk: sell positions, raise cash, reduce leverage. This prevents catastrophic losses. For example, if you're down 25%, you need a 33% gain to recover; if down 50%, you need 100%. The circuit breaker stops the slide before recovery becomes impossible.

Surprising Application¶

Energy and productivity management. Track your peak productivity capacity versus current state. If your effective working hours have declined from 50/week (peak) to 30/week (current), you're in a 40% "productivity drawdown." Implement recovery protocols: reduce commitments, take time off, address health issues. Don't try to "power through" or take on new projects when already in drawdown—that deepens the hole. Recovery requires defensive action first.

Failure Modes¶

Stop-loss rules can lock in losses just before recovery (selling at the bottom). Arbitrary thresholds may trigger unnecessarily or not trigger when needed. Doesn't distinguish between volatility (temporary price swings) and permanent capital impairment. Can create whipsaw—sell low, then rally, then buy back higher. Ignores causes—defensive action may not address underlying problem. Psychological difficulty—hard to stick to rules during panic.

Go Deeper¶

Grossman & Zhou, "Optimal Investment Strategies for Controlling Drawdowns" (1993); Magdon-Ismail et al., "On the Maximum Drawdown of a Brownian Motion" (2004)