In one sentence: Munger says Buffett and Munger got only 10 or 15 businesses really right in 60 years, so the job is to avoid losses with a margin of safety and to widen your circle of competence slowly, with a good deal of talk about how upbringing limits what occurs to you.
Key ideas
- A handful of big wins. Munger said about 10 or 15 businesses made the difference in 60 years. What matters is not losing on the rest. [00:00–01:30]
- Berkshire itself was a mistake. Buffett bought the textile company cheap, then the industry moved overseas. The low price let him get out close to break-even. [02:00–04:00]
- Margin of safety covers errors you can't foresee. Even Buffett and Munger did not call 2008, though Phil says Buffett warned about derivatives earlier. After the crash, Buffett bought housing-linked businesses. [05:00–08:00]
- Read Buffett's letters. They are free at berkshirehathaway.com and candid about his mistakes. [04:30–06:00]
- You can't think of what hasn't occurred to you. Phil and Danielle disagree about whether you can know what you don't know. Phil's view is that someone else often has to point it out. The reliable first step is the question "am I capable of understanding this?" [07:00–11:00]
- Experience gaps hide. Phil's horse example: someone expert with tractors still needs careful instruction about horses. Investing outside your circle is the same. [10:00–14:00]
- Stay a student. As you improve it gets easier to think you know more than you do, and that is when expensive mistakes happen. Danielle ties this to treating investing as a practice. [14:00–16:00, 24:00–27:00]
- Canyon: an inch wide, a mile deep. Go deep in one area first, then widen. Losses are survivable at $10,000 and devastating at a retiree's life savings. [16:00–17:30]
- Join a "family" that knows. If your own family can't teach investing, learn from Graham, Buffett, Munger, Marks, Greenblatt, Spier and Pabrai, whose books and letters act like extended family. [35:00–39:00]
- Expectation and information together. Information without any expectation (or the reverse) may not stick. [38:30–41:00]
How it maps to RuleOne
- Use the All stocks page to stay inside a narrow canyon: pick one industry and learn it before widening.
- Notes written about a stock on its page are one way to record what you know and don't.
Buffett, Munger and Graham links
- Buffett's 1996 Berkshire letter on the circle of competence: its size matters less than knowing its edges.
- Munger's inversion ("tell me where I'm going to die, so I'll never go there") is a theme Phil returns to.
- Graham, The Intelligent Investor (1949), chapter 20, on margin of safety. Howard Marks, The Most Important Thing.
Words to know
- Canyon: Phil's image for a narrow, deep area of expertise.
- Circle of competence: the businesses you can genuinely understand.
Try this
List three industries you already know from work or daily life. Pick one and write five things you can explain about how it makes money and five that you can't. Use /stocks/ to look at one company there.
Check yourself
- Why did Berkshire Hathaway's textile mistake not ruin Buffett?
Answer
He bought cheap, so he could break even on the exit. - What question should you ask when a new business appears?
Answer
Am I capable of understanding it? - What does "an inch wide and a mile deep" mean?
Answer
Master one narrow area deeply first, then widen it slowly.
Short quotes
"Buy it with a big margin of safety, because of the vicissitudes of life." (Phil, ~06:00, auto-transcribed)