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Charlie Munger, Warren Buffett's partner and vice chairman of Berkshire Hathaway, stresses the importance of having a broad theoretical toolbox - not to be a good academic, but to have a good, pragmatic grip on reality. He regularly explains to students which mental models have proven most useful to help him understand markets and human behaviour. He advocates looking out for the most powerful concepts in every discipline and to try to understand them so thoroughly that they become part of our thinking. The moment one starts to combine these mental models and attach one's experiences to them, one cannot help but gain what he calls "worldly wisdom." The importance is to have not just a few, but a broad range of mental models in your head. Otherwise, you risk becoming too attached to one or two and see only what fits them. You would become the man with a hammer who sees nails everywhere