First, there’s mathematics. Obviously, you’ve got to be able to handle numbers and quantities — basic arithmetic. And the great useful model, after c… - Charlie Munger

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First, there’s mathematics. Obviously, you’ve got to be able to handle numbers and quantities — basic arithmetic. And the great useful model, after compound interest, is the elementary math of permutations and combinations. That was taught in my day in the sophomore year in high school. I suppose by now, in great private schools, it’s probably down to the eighth grade or