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What exactly are we all talking about here when we use the phrase "mental models"?

The most memorable use of the phrase to me is Charlie Munger's "Poor Charlie's Almanack". If I recall correctly, whenever he makes a big decision, he runs through a checklist of each of his MMs, to see if that way of thinking gives him any insight into the matter at hand. The key thing, though, is that it isn't just limited to human psychology. He supposedly has a great interest in a whole variety of fields. A Renaissance Man. For example, I recall him using thermodynamics as a metaphor for explaining some seemingly-unrelated topic (e.g. business analysis).




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