Inversion
"Invert, always invert." — Carl Jacobi (mathematician), adopted by charles-munger.
Inversion means solving problems backward: instead of asking "How do I succeed?", ask "How would I fail?" Then avoid those failure modes. Munger found that problems which resist direct solution often yield easily to inversion.
How It Works
| Direct Approach | Inverted Approach |
|---|---|
| "How can I help India?" | "What would hurt India most? Avoid that." |
| "How do I have a good life?" | "What guarantees a terrible life? Sloth, unreliability, ideology, envy, self-pity. Avoid those." |
| "How do I make money investing?" | "How do people go broke? Over-leverage, illiquidity, overconfidence, concentrated wrong bets. Avoid those." |
Why Inversion Works
- Algebraic principle — if A=B and B=C then A=C. Functional equivalents are everywhere once you look.
- Asymmetry of knowledge — it is often easier to identify what causes failure than what causes success.
- Avoidance is simpler — you can often prevent disaster more reliably than you can engineer success.
Munger's USC Commencement Application
At the USC commencement, Munger inverted the question "What makes a good life?" into "What guarantees a bad life?" and listed: sloth, unreliability, intense ideology, envy, resentment, self-pity, drug dependency, and working under people you don't admire.
Connection to Other Concepts
- first-principles-thinking — inversion is a first-principles technique applied in reverse
- second-order-thinking — inversion is one way to uncover second-order consequences
- iron-prescription — Darwin's disconfirming evidence method is inversion applied to your own beliefs
- psychology-of-human-misjudgment — Munger built his psychology system by inverting: collecting instances of bad judgment rather than theorizing about good judgment