#1
Deep Research
"Understand the business deeply before investing. Read everything available. Talk to customers and competitors."
Deep business understanding through exhaustive research is the foundation of investing.
Read Full Analysis →
Li Lu📌 Business Judgment
Li Lu's Business Judgment Rules
These are 3 Business Judgment principles distilled from Li Lu'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.
matrix.rulesQuickChecklistTitle
- Clarify your decision: time horizon, position size, and what would change your mind.
- Choose 3–5 principles from this Business Judgment set and write each as a yes/no check.
- Define 2–3 disconfirming signals (invalidation triggers) before you act.
- Record the inputs you used (numbers, sources, assumptions) so you can audit later.
3 principles·Business Judgment
3 Key Business Judgment Principles
#2
Owner Mentality
"Think like an owner, not a trader. Would you want to own this entire business?"
Think like an owner evaluating entire business acquisition, not a trader.
Read Full Analysis →#3
Management Evaluation
"Evaluate management by their actions, not their words. Look for a track record of capital allocation, shareholder communication, and aligned incentives."
Judge management by actions, not words.
Read Full Analysis →How to apply Li Lu's Business Judgment principles
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.
- Clarify your decision: time horizon, position size, and what would change your mind.
- Choose 3–5 principles from this Business Judgment set and write each as a yes/no check.
- Define 2–3 disconfirming signals (invalidation triggers) before you act.
- Record the inputs you used (numbers, sources, assumptions) so you can audit later.
- Run the checklist when you feel urgency (FOMO, panic) and delay action if you cannot answer.
- Review outcomes on your cadence: what you followed, what you ignored, and what to adjust next cycle.
Boundaries and common misreads
- Don’t treat a principle as a buy/sell signal—convert it into evidence you can verify.
- Avoid “name-dropping” Li Lu: if you can’t explain the reasoning, you can’t borrow the rule.
- If the situation is outside your circle of competence, the right move is often to pass.
- Separate risk from uncertainty: write what could go wrong and what would confirm it.
- If two principles conflict, slow down and document the trade-off instead of forcing certainty.
Rehearse a scenario decision → ·Run a weekly toolkit → ·Browse all principles →
About Li Lu
He is one of the few fund managers to have Charlie Munger as a personal investor, and Munger has called him one of the finest investors he has ever known. After coming to the United States, he earned degrees from Columbia University in economics, law, and busi…
Frequently Asked Questions
What are Li Lu's key business judgment principles?
Li Lu has 3 key principles on business judgment. The most important one is "Deep Research" — Understand the business deeply before investing.
How does Li Lu apply business judgment in practice?
Li Lu applies business judgment through several key principles including "Deep Research" and "Owner Mentality". These principles guide practical investment decisions and have been tested across decades of market cycles.
What makes Li Lu's approach to business judgment unique?
Li Lu's approach to business judgment is distinguished by a focus on long-term thinking and fundamental analysis. With 3 specific principles in this area, Li Lu provides a comprehensive framework that investors at any level can study and apply to improve their decision-making.
How do I validate Li Lu's Business Judgment rules without blindly copying them?
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.
What’s a practical review cadence for applying Business Judgment principles?
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.
