These are 3 Investment Philosophy principles distilled from Charlie Munger's writing and public remarks. Use them as a decision checkpoint: translate each rule into a yes/no test, write what evidence would change your mind, and set a review date before you act. When a rule feels vague, open the full principle page and capture the driver you can verify (cash flows, leverage, incentives, competitive edge). This is educational, not investment advice—double-check primary sources and fit every rule to your time horizon, risk budget, and constraints.
"Sit on your ass investing. You're paying less to brokers, you're listening to less nonsense. And if it works, the tax system gives you an extra one, two, or three percent per annum."
Inactivity is often the wisest investment strategy.
Read Full Analysis →"You must know the big ideas in the big disciplines and use them routinely — all of them, not just a few. Most people are trained in one model and try to solve all problems in one way."
Draw from multiple disciplines for better investment decisions.
Read Full Analysis →"Invert, always invert. Turn a situation or problem upside down. Look at it backward. What happens if all our plans succeed? What happens if they don't?"
Approach problems by considering the opposite perspective.
Read Full Analysis →Use this page as a workflow, not a collection of quotes. Pick 3–5 principles, translate each into a concrete check, and review your decisions on a fixed cadence. These are educational guardrails—always verify facts and match them to your own constraints.
Rehearse a scenario decision → ·Run a weekly toolkit → ·Browse all principles →
He served as vice chairman of Berkshire Hathaway and was Warren Buffett's closest partner for over five decades. Munger was renowned for his multidisciplinary approach to investing, advocating for the use of mental models from various fields including psycholo…
Charlie Munger has 3 key principles on investment philosophy. The most important one is "Sit on Your Ass Investing" — Sit on your ass investing.
Charlie Munger applies investment philosophy through several key principles including "Sit on Your Ass Investing" and "Multidisciplinary Approach". These principles guide practical investment decisions and have been tested across decades of market cycles.
Charlie Munger's approach to investment philosophy is distinguished by a focus on long-term thinking and fundamental analysis. With 3 specific principles in this area, Charlie Munger provides a comprehensive framework that investors at any level can study and apply to improve their decision-making.
Treat each principle as a hypothesis. Write the evidence you would need, collect it from primary sources when possible (filings, letters, transcripts), and note what would invalidate the conclusion. If you can’t define inputs and triggers, you’re not applying the rule—you’re quoting it.
Pick a cadence you can sustain (weekly or monthly) and review process signals first: whether you followed your checklist, respected your boundaries, and documented assumptions. Only then look at outcomes. The goal is fewer low-quality decisions, not perfect prediction.
