Charlie Munger on having and using multiple mental models

“What are the models? Well, the first rule is that you’ve ot to have multiple models — because if you just have one or two that you’re using, the nature of human psychology is such that you’ll torture reality so that it fits your models.”

“You must know the big ideas in the big disciplines, and use them routinely — all of them, not just a few. Most people are trained in one model — economics, for example — and try to solve all problems in one way. You know the old saying: to the man with a hammer, the world looks like a nail. This is a dumb way of handling problems.”

~ from the book, Charlie Munger, The Complete Investor