The 25 Cognitive Biases: Munger’s Psychology of Human Misjudgment

Why your brain misjudges — and what to do about it

Your mind is not a neutral instrument. It runs on shortcuts that were tuned for survival in small groups, not for evaluating a business deal, a job offer, a headline, or a person you happen to like. Most of the time those shortcuts serve you well. The rest of the time they quietly steer you into decisions you would never defend if you saw them clearly.

This course walks through twenty-five of those shortcuts, one lesson at a time. Each lesson names a single tendency, explains the machinery underneath it, shows where it turns up in ordinary life, and gives you concrete countermeasures you can actually apply. The goal is not to memorize a list of terms. It is to build a checklist you can run against your own thinking before the decision is made rather than after.

What you will learn

• How incentives shape behavior far more powerfully than stated intentions or good character
• Why liking and disliking distort what you are able to see about people, products, and ideas
• How the mind manufactures certainty, consistency, and comfort at the expense of accuracy
• Why losses, comparisons, and scarcity trigger reactions wildly out of proportion to the stakes
• How social pressure, authority, and mere association override independent judgment
• What happens when several of these tendencies stack at once — and why that is where the real damage occurs

Who this is for

Investors, founders, managers, negotiators, teachers, clinicians, and anyone who makes consequential decisions under uncertainty. No background in psychology or economics is required. If you have ever wondered why smart people do obviously foolish things — including you, on a bad day — this is the material.

How the course works

Twenty-five short lessons, grouped into five thematic modules. Each lesson stands on its own and takes roughly ten minutes. Work through them in order for the full arc, or jump to the tendency that is currently costing you something. The final lesson pulls everything together and is the one worth rereading.

Source and attribution

The twenty-five tendencies covered here come from Charlie Munger’s talk The Psychology of Human Misjudgment, most widely available in Poor Charlie’s Almanack (edited by Peter D. Kaufman). Munger, the longtime vice chairman of Berkshire Hathaway, assembled the list over decades of observing how intelligent people reach unintelligent conclusions. The framework and the names of the tendencies are his. The explanations, examples, and exercises in these lessons are written for this course and are not reproductions of his text — students who want the original are strongly encouraged to read it in full.

Ember Author

About the instructor