When Warren Buffett uses the phrase "intrinsic value" in a 1965 partnership letter, he means something subtly but importantly different from what he means in his 2025 farewell letter. Understanding that evolution isn't just academic — it shapes how you should think about every investment decision today.
The Graham Foundation (1950s–1960s)
Buffett's mentor Benjamin Graham defined intrinsic value with mathematical precision: it was the present value of future earnings, discounted at the long-term government bond rate, using conservative assumptions about growth. The margin of safety — buying at a discount to this calculated value — was the entire philosophy.
In the partnership letters, you can see young Buffett applying this framework religiously. The 1962 letter discusses buying Berkshire Hathaway shares at a discount to net current assets alone — pure Graham methodology. When he liquidated the partnership in 1969, it was because the market had largely eliminated these obvious discounts.
The Munger Influence (1970s–1980s)
Charlie Munger introduced a critical modification: quality matters, and you don't need the same margin of safety for a wonderful business as for a mediocre one. The 1977 letter marks this transition explicitly. Buffett begins talking about businesses with "城堡" — moats — as worthy of higher valuations, even without the deep discounts Graham required.
The intrinsic value calculation started including qualitative factors: franchise strength, management quality, competitive positioning. This wasn't abandoning Graham; it was extending him.
"The key to investing is not determining how much an asset is worth to other people — what they will pay for it — but rather determining what the business is worth to its owners, present and future."
— 1992 Berkshire Hathaway Letter
The Modern Framework (1990s–Present)
By the 1990s, Buffett had crystallized his definition: intrinsic value is the present value of future cash flows, discounted at an appropriate interest rate, generated by a business over its remaining life. The "appropriate rate" is typically the US Treasury rate, or a slight premium. The "future cash flows" must be estimated conservatively.
What changed most is the role of intangibles. In the 2000 letter, Buffett discusses the "owner earnings" concept — cash available to owners after maintaining competitive position and capital expenditure — which explicitly includes the value of intangible assets like brand, customer loyalty, and management quality that don't appear on balance sheets.
What This Means for You
The evolution of Buffett's intrinsic value framework has a practical implication: the harder a business is to value precisely, the more important it is to demand a lower purchase price. A simple business with predictable cash flows (like See's Candies in the early days) can be valued with less margin of safety. A complex business with uncertain future earnings (like IBM in 2011, or Apple in 2016) requires a larger discount.
The common thread across all three eras: Buffett never tries to calculate intrinsic value to the nearest dollar. He calculates it approximately, then compares it to price. If price is meaningfully below his estimate of value, the investment passes. If not, it doesn't — regardless of what the spreadsheet says.