In one sentence: If you invest the Rule #1 way, your errors should be things you passed on, not losses you took. Danielle tests this on Lululemon (a stock she passed on in 2016 that later rose a lot) by running Munger's four filters on what she knew then, and Phil concludes it wasn't a mistake.
Key ideas
- Few rules, real effort. Phil recites Munger's four filters (understand, moat, management, margin of safety). It is simple but takes work, and the "practice" of investing means finding joy in learning something hard. [00:00–04:00]
- Patience plus the basics. Competent quickly, but only if you do nothing until the situation is easy to understand. [05:00–07:00]
- Snowboarding analogy. A beginner stays on a gentle slope. In investing, that means waiting for obvious bargains (such as after a recession) and accepting that you will watch some turns you could have made. [07:00–09:30]
- Mistakes of omission will always happen. If you do it right, the errors are missed winners, not losing trades, and Munger still remembers some from decades back. [09:30–11:00]
- Review honestly. Danielle says you should be ruthless about whether a pass was an error, because avoiding it means you can't tell if you'd repeat it. [10:30–12:00]
- Case: Lululemon in 2016. Understandable retail business, so the first filter passed. [18:00–20:30]
- Moat. Danielle sees a brand moat (she prefers its leggings), and Phil notes brand moats in fashion are real but hard to hold for long. [20:30–26:30]
- Management was the problem. The founder was out after remarks and was publicly criticising the company, and a new CEO was arriving. Phil calls a new CEO an automatic red flag: a prompt to dig deep, not an automatic no. Contrast with Chipotle, where a founder-CEO returned to take control of operations. [26:30–36:00]
- Valuation was moot. With no clear view of ten years out, there was nothing to value with confidence (it was debt-free, a plus). Phil: without that view, it was an expert's "black diamond" hill. [36:00–39:00]
- Options are not the cure. Phil says a call option on the idea would likely have expired before the stock moved, and calls it gambling. [39:00–42:30]
- When caution becomes the mistake. Once you really know a company and the price is right, the error is not buying enough ("load up the truck"). [44:00–45:30]
How it maps to RuleOne
- The screen's job is to surface candidates; the management and moat judgement still needs your reading of the company page. A recent CEO change belongs on your list of red flags.
- Keep a short log of passed-on stocks with the reason, then review it later. Use /stocks/ to see the stock you passed on and compare.
- A starter position then adding is a way to learn, but only after the filters pass.
Buffett, Munger and Graham links
- Munger on "mistakes of omission" is a recurring theme in Daily Journal meeting talks (the one cited here is from February 2019). Buffett also says in his letters that his biggest regrets are things he didn't do.
- Buffett's "wait for the fat pitch" idea (a batter who needn't swing at every ball) is the same patience Phil describes.
- Graham's margin of safety: not enough clarity on value means no margin can be defined.
Words to know
- Mistake of omission: passing on something that later does well. Mistake of commission: buying something that loses.
- Red flag: a warning that needs deep investigation, not necessarily a rejection.
- Call option: a contract giving the right to buy at a fixed price by a set date. Phil treats it as gambling and not investing.
Try this
Think of one stock you passed on and it rose. On a sheet, mark which of the four filters failed at the time, using only what you knew then. Decide whether the pass was a mistake, then check the stock on /stocks/.
Check yourself
- What is the difference between a mistake of omission and one of commission?
Answer
Omission is passing on something that later rose; commission is buying something that loses money. - Why was Lululemon a pass in 2016, according to the discussion?
Answer
Management was in flux (founder exit, new CEO), so the ten-year future could not be known. - Is a new CEO a reason to reject?
Answer
No. It is a red flag that requires deep study. - What is the opposite mistake Phil warns about?
Answer
Being too cautious on a company you do understand at a good price, and not buying enough.
Short quotes
"Your mistakes are going to be mistakes of omission." (Phil, ~09:50, auto-transcribed)