What Does 'Fair Value' Actually Mean for a Stock?
The short answer. Fair value is an estimate of what a business is worth based on the cash it is expected to produce, rather than what its shares happen to be trading at. It is produced by a model, it depends entirely on the assumptions fed into it, and two careful analysts will reach different numbers from the same accounts. It is an argument about a company, not a measurement of one.
How is fair value calculated?
Most methods are a version of the same idea: estimate the cash a business will generate, decide what future cash is worth today, add it up.
| Method | What it uses | Where it breaks |
|---|---|---|
| Discounted cash flow | Forecast free cash flow, a discount rate, a terminal value | Most of the answer sits in the terminal value, which is the least knowable part |
| Earnings power | Current earnings and a sustainable growth rate | Assumes today's earnings are normal, which is false at both ends of a cycle |
| Multiples | A peer group's P/E or EV/EBITDA | Tells you a company is cheap relative to peers in a year when every peer is expensive |
| Asset based | Book value, replacement cost | Ignores the earning power of the assets entirely |
Why do two analysts get different answers?
Because of the discount rate, mostly. In a discounted cash flow, the terminal value — the lump representing every year beyond the explicit forecast — is usually more than two thirds of the total. That lump is extremely sensitive to the rate used to discount it. Moving a discount rate from 8% to 9% can cut a fair value by a fifth without changing a single forecast about the business.
This sensitivity is not a flaw to be engineered away. It is the honest reflection of the fact that a company's value genuinely does depend on how much you should be paid to wait and to take risk, and reasonable people disagree about that.
If a stock trades below fair value, is it a buy?
No, and treating it that way is the most common misuse of the concept. A discount to your model is a reason to start reading, not a reason to buy. The market may be pricing in something your inputs do not contain. The productive question when a gap appears is always the same: what does the market know that this model does not?
What is a margin of safety?
Benjamin Graham's answer to the fact that fair value estimates are wrong: only buy at a meaningful discount to your estimate, so that being wrong about the business still leaves you roughly whole. A third below is the traditional figure. It is not a precision instrument — it is an admission that the precision is not there.
What this cannot tell you
- When. A gap can persist for years, or close by the business deteriorating to meet the price.
- Whether your assumptions are sane. A model will produce an answer from nonsense inputs without complaining.
Educational information, not financial advice. Every figure on this page is read from the source filings when the page loads rather than written into the article, so what you are reading is today's data and not a snapshot of the day it was published.
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