If you have heard Charlie Munger talk about decision-making, you know he insists on a latticework of mental models. Math is one of the richest sources of those models, not because of equations alone, but because of the patterns of growth, risk, and reality checks it reveals.
1. Compounding
Compounding is exponential growth in action. Money, habits, and knowledge all compound. Start early, stay consistent, and avoid unnecessary interruptions.
2. Power Laws
The 80/20 rule is a power law in disguise. A few inputs often drive most results. Ask: what are the few things that matter most? Then cut the trivial many.
3. Regression to the Mean
When something swings to an extreme - a lucky stock pick or a terrible week - it often drifts back toward average. Do not build your worldview from outliers.
4. Base Rates
Before making a prediction, ask what usually happens in similar situations. If the base rate is against you, you need extraordinary evidence or a smarter plan.
5. Expected Value
Not all wins and losses are equal. Thinking in probabilities helps you judge risky projects, career moves, and bets more clearly.
6. Sensitivity Analysis
Change one variable at a time and see what moves the outcome. When debugging, investing, or changing habits, do not tweak everything at once. Learn what actually drives results.