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What does Warren Buffett think of discounted cash flow (DCF) models?

All investing is laying out cash now to get some more back in the future. The concept of “a bird in the hand” came from Aesop in about 600 BC. He knew a lot, but not that [he lived in] 600 BC. He couldn’t know everything. [laughter] The question is, how many birds are in the bush? What is the discount rate? How confident are you that you’ll get [the bird]? Et cetera. That’s what we do. If you need to use a computer or calculator to figure it out, you shouldn’t [buy the investment]. Those types of [situations] fall into the “too-hard” bucket. It should be obvious. It should shout at you, without all the spreadsheets. We see something better.

Munger: Some of the worst business decisions I’ve seen came with detailed analysis. The higher math was false precision. They do that in business schools, because they’ve got to do something.

The priesthood has to look like they know more than “a bird in the hand.” You won’t get tenure if you say “a bird in the hand.” False precision is totally crazy. The markets saw it in the Long-Term Capital Management [hedge fund] in 1998. It only happens to people with high IQs. The markets of mid-September last year were [such that] you can’t calculate standard deviations. People’s actions don’t observe laws of math. It’s a terrible mistake to think higher math will take you a long way— you don’t need to understand it, [and] it may lead you down the wrong path.

Source: Berkshire Hathaway Annual Meeting
Time: 2009

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