A-TIER technique
Charlie Munger's inversion — solve problems by asking how to cause failure
100k ft — What is this?
Charlie Munger's inversion — solve problems by asking how to cause failure
50k ft — Why care?
Munger explains inversion with his WWII meteorologist job: ask how you'd kill pilots (icing, running out of fuel), then avoid those. Same move for any problem: list what would hurt it most and steer clear.
10k ft — Key takeaways
• Pairs naturally with pre-mortems
• Reframe 'how do I succeed' as 'what would guarantee failure' and avoid those paths
• Works for system design and risk reviews as well as investing
5k ft — Tools & techniques
(no tools tagged)
inversion, mental models
1k ft — Deep-dive / try it
Charlie Munger (January 1, 1924 – November 28, 2023) was an American investor, businessman, attorney, and philanthropist best known as the longtime vice chairman of Berkshire Hathaway. Widely regarded as one of the greatest business thinkers of his generation, Munger played a pivotal role in shaping Berkshire Hathaway alongside Warren Buffett. His multidisciplinary approach to decision-making and emphasis on rational thinking transformed the way countless investors and entrepreneurs approach business and life.
Originally trained as a lawyer, Munger developed an investment philosophy that extended beyond traditional financial analysis. He championed the use of “mental models”—drawing insights from psychology, economics, mathematics, biology, history, and other disciplines—to make better de…
Transcript excerpt
Are there any tools or behaviors you embrace to facilitate your rational thinking? The answer is of course, how do they do anything else? One of my favorite tricks is the inversion process. I'll give you an example, when I was a meteorologist in World War, they told me how to draw weather maps and predict the weather, but what I was actually doing is clearing pilots to take flights. It just reversed the problem, I inverted it. I said suppose I wanted to kill a lot of pilots, what would be the easy way to do it? I soon concluded the only easy way to do it would be to get the planes into icing the planes couldn't handle, or to get the pilot to a place where he'd run out of fuel before he could safely land. So I made up my mind I was going to stay miles away from killing pilots by either icing or getting them into sock conditions when they couldn't land. I think that helped me be a better meteorologist in World War. I just reversed the problem. If somebody hired me to fix India, I would immediately say, what could I do if I really wanted to hurt India? I'd figure out all the things that would most easily hurt India, and I'd figure out how to avoid them. You'd say it's the same thing, it's just in reverse. It works better to free them to invert the problem. You're a meteorologist, it really helps if you really know how to avoid something, which is the only thing that's going to kill your pilot. You can help India best if you understand what will really hurt India the easiest and…