In one sentence: Phil and Danielle define confirmation bias as the inability to hear the "inversions" against your case, then use a bank's San Diego loan and the Theranos story to show how investors should act like a reporter for their own newspaper and walk away when the business is too hard to check.
Key ideas
- Everyone is a potential investor. Phil's example: a fly-fishing guide who worked for Bill Ackman as an analyst, found reading all day in a cubicle wasn't for him and left. The point is that breadth plus time can make anyone good. [03:00–06:00]
- Good ideas plus dumb additions. Danielle says as a self-taught investor she fears layering wrong ideas on right ones; school is where that gets stripped out. [08:00–11:00]
- A better definition of confirmation bias. Not "thinking your report is good", but being unable to see the inversions: you turn each criticism into a positive. Defence needs humility and also real depth in the field. [11:00–15:00]
- A relationship tip. Danielle's argument tip: say "we are a team against the problem". [13:00–14:00]
- The bank example. Phil and Danielle's bank holding fell 20–25% after an article on its loans. A fall can mean smart people leaving or dumb people leaving, so you go and find out. They visited a San Diego waterfront life-sciences building the bank had financed, which stood empty because the life-sciences firms are 15 miles north. [15:00–19:00]
- The open question. Phil says the hard part is whether it was a one-off error or one of several. The bank is not named. [19:00]
- Be a reporter for your own newspaper. Talk to many people, read competitors, and use Templeton's/Fisher's "scuttlebutt". Stay neutral until the evidence is overwhelming. Sometimes you can't find anyone on the other side, and that is evidence too. [19:00–23:00]
- Investors can quit; reporters can't. A reporter must finish the story. An investor can stop when it gets too hard, and hubris starts when you drift outside your circle. [26:00]
- Theranos. Phil says the Wall Street Journal reporter's method (competitors, suppliers, layers of the company) is the same as an investor's. Phil's lesson: with a black box and a famous board, if you can't check it, it's too hard. [22:00–29:00]
- A friend's water-treatment deal. Phil says a friend put seven figures into a "black box" device. He told them to pay a professional $1,000 a day to open it, or stay away. It turned out fraudulent. [26:00–29:00]
- Keep the circle small. An inch wide and a mile deep. Danielle pushes back that 10 hours of reading can still be useful, as long as you say you don't know everything. [30:00–31:30]
- BYD regret. Danielle skipped BYD because she knew nothing about China or EVs, and now sees its ads at the Euros. Phil replies that was by the rules. [32:00–33:30]
How it maps to RuleOne
- The screen's too-hard rule matches the take-away: if you can't verify the business, don't buy it.
- Event flags (drawdowns, insider buys) are where "go and find out" starts, as with the bank.
- Debt and statement checks on /stock/TICKER/ help spot companies whose story outruns their numbers.
Buffett, Munger and Graham links
- Fisher's Common Stocks and Uncommon Profits (ch. 1–2) describes scuttlebutt; Phil attributes the word to Templeton, which you should check.
- Buffett's "too hard" pile and circle of competence (Berkshire letters, for example 1996).
- John Carreyrou's Bad Blood (2018), the book on Theranos.
Words to know
- Scuttlebutt: gossip and gathered talk from customers, staff and rivals.
- Inversion: arguing the case against your own idea.
- Black box: a product or accounts you can't inspect.
Try this
Pick a holding on /holdings/ or a name on /stocks/. Write its three strongest arguments against, then find one independent source (competitor filing, trade press) for each. If you can't, put it on your too-hard list.
Check yourself
- How do Phil and Danielle define confirmation bias?
Answer
Being unable to see the inversions: you turn every criticism into a positive. - Why can an investor do something a reporter can't?
Answer
Stop when it is too hard to verify, instead of having to finish the story. - What did the bank's empty building teach?
Answer
A price fall needs checking in the real world: here the problem was real, and the question became whether it was an isolated mistake.
Short quotes
"It's about being a reporter for your own newspaper." (Phil, ~19:30, auto-transcribed)