We believe that almost all really good investment records will involve relatively little diversification. The basic idea that it was hard to find good investments and that you wanted to be in good investments, and therefore, you'd just find a few of them that you knew a lot about and concentrate on those seemed to me such an obviously good idea. And indeed, it's proven to be an obviously good idea. Yet 98% of the investing world doesn't follow it. That's been good for us.
Charlie MungerThere are two kinds of businesses: The first earns 12%, and you can take it out at the end of the year. The second earns 12%, but all the excess cash must be reinvested - there's never any cash. It reminds me of the guy who looks at all of his equipment and says, 'There's all of my profit.' We hate that kind of business.
Charlie MungerA lot of people with high IQs are terrible investors because they've got terrible temperaments. And that is why we say that having a certain kind of temperament is more important than brains. You need to keep raw irrational emotion under control. You need patience and discipline and an ability to take losses and adversity without going crazy. You need an ability to not be driven crazy by extreme success
Charlie MungerIn engineering, people have a big margin of safety. But in the financial world, people don't give a damn about safety. They let it balloon and balloon and balloon. It's aided by false accounting.
Charlie MungerThe lawyers have escaped most criticism [and undeservedly so]. The tax shelters [were approved by lawyers, who got paid huge commissions to do so] and every miscreant had a high-falutin' lawyer at his side. Why don't more law firms vote with their feet and not take clients who have signs on them that say, "I'm a skunk and will be hard to handle?" I've noticed that firms that avoid trouble over long periods of time have an institutional process that tunes bad clients out. Boy, if I were running a law firm, I'd want a system like that because a lot of firms have a lot of bad clients.
Charlie Munger