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The Great Mental Models, Volume 3By: Shane Parrish, Rhiannon Beaubien, Rosie Leizrowice Series: The Great Mental Models Series From the New York Times bestselling author of Clear Thinking and Farnam Street founder, Shane Parrish. The third book in the timeless Great Mental Models series. Time and time again, great thinkers such as Charlie Munger and Warren Buffett have credited their success to mental modelsrepresentations of how something works that can scale onto other fields.
By: Shane Parrish, Rhiannon Beaubien, Rosie Leizrowice | Series: The Great Mental Models SeriesFrom the New York Times bestselling author of Clear Thinking and Farnam Street founder, Shane Parrish.
The third book in the timeless Great Mental Models series.
Time and time again, great thinkers such as Charlie Munger and Warren Buffett have credited their success to mental models–representations of how something works that can scale onto other fields.
Mastering a small number of mental models enables you to rapidly grasp new information, identify patterns others miss, and avoid the common mistakes that hold people back.
Volume 3 of The Great Mental Models series focuses on systems and mathematics, simplifying more than twenty-four key concepts from these technical fields into easy-to-understand terms. It provides insights into the unseen mechanisms that influence our environment and teaches you how to apply these principles to benefit your life.
Some of the mental models covered in this book include:
- Margin of Safety: Engineers design for extremes, not averages. To create a robust system, ensure a meaningful gap between what the system is capable of handling and what it is required to handle.
- Compounding: The most powerful force in the universe can work in domains other than money.
- The law of diminishing returns: Inputs to a system lead to more output, up until a point where each further unit of input will lead to a decreasing amount of output.
- Regression to the mean: Above- or below- average performance tends to correct towards the average over the long term.
The Great Mental Models series demystifies once elusive concepts and illuminates rich knowledge that traditional education overlooks. This series is the most comprehensive and accessible guide on using mental models to better understand our world, solve problems, and gain an advantage.
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It helped with my daughters eczema the scent is great and easy on her skin
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Reviewed in the United States on February 16, 2026
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That the product does what it says it will.
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My itchy scalp
Maybe I was expecting miracles, but it didn’t do as well as I thought it did. I’m still using it hoping that I was expecting too much too soon, but it’s been almost a month now and my head is still itchy and scaly.
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All natural for sensitive skin
It's all natural and easy on your skin without an overpowering scent.
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Husband’s eczema is slowly going away
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I didn’t think eczema could be improved by something as simple as changing to bar soap. A gentle eczema friendly one at that! My husband loved this soap immediately and he’s one of those crunchy/almond moms (lol). He uses it in the shower and he doesn’t want to share the bar with me 🤣 it smells SO good and moisturizes and cleans so well without drying. He is noticing his eczema on his hands is improving and what was red and lumpy scabbing is now smooth scabbing with almost no redness. I have it on auto buy now. I plan to use it on my sink too once I finish my bottle of liquid soap! 5 stars.
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Reviewed in the United States on April 30, 2026
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