These are 3 Mental Models principles distilled from Benjamin Graham'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.
"Imagine having a partner named Mr. Market who offers to buy or sell shares at a different price every day. Sometimes his price is reasonable, but often it is absurdly high or low. You are free to ignore him."
The market is your servant, not your master.
Read Full Analysis →"The intrinsic value of a stock is the value justified by the facts — the assets, earnings, dividends, and definite prospects. This value is independent of the market price."
Intrinsic value exists independently of market price.
Read Full Analysis →"Confronted with the need to estimate future growth, I am ready to adopt as a rule of thumb a margin of safety of about 50%. The function of the margin of safety is to render unnecessary an accurate estimate of the future."
Margin of safety eliminates the need for precise predictions.
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 →
Graham taught at Columbia Business School for nearly three decades, where his students included Warren Buffett, who later called him the second most influential person in his life after his father. Market." Graham advocated for a disciplined, emotionally detac…
Benjamin Graham has 3 key principles on mental models. The most important one is "The Mr. Market Parable" — Imagine having a partner named Mr.
Benjamin Graham applies mental models through several key principles including "The Mr. Market Parable" and "Intrinsic Value Model". These principles guide practical investment decisions and have been tested across decades of market cycles.
Benjamin Graham's approach to mental models is distinguished by a focus on long-term thinking and fundamental analysis. With 3 specific principles in this area, Benjamin Graham 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.
