Estimating Intrinsic Value Without Fooling Yourself

Estimating Intrinsic Value Without Fooling Yourself

By the WealthOS Research Desk

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Introduction

Intrinsic value is the only anchor a value investor has. It is also, as Buffett has repeatedly pointed out, an estimate rather than a precise figure — he has described it as the discounted value of the cash that can be taken out of a business during its remaining life, and noted that it is far better to be approximately right than precisely wrong.

The difficulty is not the arithmetic. It is that the arithmetic will produce whatever you want it to. A discounted cash flow model is a machine for manufacturing confidence: choose your growth rate and your discount rate and you can justify almost any price.

So the discipline is not knowing how to build a model. It is knowing how to break your own.

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Start With Owner Earnings, Not Earnings

Before any discounting, you need a number that represents the cash the business actually produces for its owners.

The concept Buffett set out in the 1986 letter is owner earnings: reported earnings, plus depreciation and other non-cash charges, less the capital expenditure the business genuinely requires to maintain its competitive position and unit volume.

The last clause is doing all the work. Most companies report capital expenditure as a single figure, mixing maintenance spending with growth spending. If you use the whole number, you understate owner earnings for a growing business. If you ignore it entirely, you overstate the cash available — which is the more common and more expensive error, because it flatters exactly the businesses that are most capital-hungry.

The practical question is not "what did they spend" but "what would they have to spend to stand still."

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The Four Inputs, and Where Each Goes Wrong

1. Free cash flow. Use a multi-year average, not the most flattering recent year. Cyclical businesses must be valued against mid-cycle earnings; using peak earnings in a peak year is the single most common valuation error.

2. Growth. Specify the source of growth and its limit. Growth comes from price, volume, new markets, or acquisitions — and the market for the company's product has a size. A growth rate of 15% sustained for a decade implies the business roughly quadruples. Ask whether that is plausible given the customer base, not merely the industry narrative.

3. Discount rate. Use a rate that reflects the uncertainty of the cash flows, not the rate that makes the answer come out attractive. A simpler and more honest alternative for many investors is to invert the tool: instead of computing a value and comparing it to the price, compute the growth rate the current price implies, and judge whether that growth rate is credible.

4. Terminal value. In most models, the terminal value is the majority of the answer. This is a warning sign, not a feature. If your valuation depends mainly on cash flows after year ten, you are not valuing a business, you are valuing a growth assumption.

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The Reverse DCF

The most useful habit in valuation is to run the model backwards.

Rather than choosing assumptions and reading off a value, take the market price as given and solve for what it requires. What growth rate does this price imply? What margin does it assume? How long must the competitive advantage last?

This works because it reframes the exercise from prediction to evaluation. You do not need to know what will happen. You need to decide whether what is *implied* is plausible.

A practical version: for a business trading at a given multiple of free cash flow, write down how many years of above-average growth the price requires. If the answer is more years than the company has existed, you have your conclusion.

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Three Ways Investors Fool Themselves

Anchoring on the current price. The number on the screen is the most available figure and the least informative about value. If the price moves 20% and your valuation does not, one of the two is not doing its job.

Letting the position create the thesis. The order matters. If you buy first and model afterwards, the model will confirm the purchase. Write the valuation before you own anything.

Confusing precision with accuracy. An answer to the second decimal place is not more reliable than an answer to the nearest ten percent. Buffett's own practice was to require a substantial gap between price and a deliberately rough value estimate, which is what margin of safety means in operation.

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A Workable Routine

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Conclusion

Intrinsic value is an estimate of cash an owner will receive, discounted for time and uncertainty. Nothing about the calculation is reliable enough to support precision, which is why the discipline is less about modelling skill and more about preventing your own preferences from entering the inputs.

Value the business before you own it. Reverse the model so the market's assumptions, not yours, are on trial. And when the estimate and the price disagree, hold the estimate loosely and the margin of safety tightly.

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This article references Berkshire Hathaway shareholder letters, including the 1986 discussion of owner earnings and Buffett's published remarks on intrinsic value and the margin of safety concept originating with Benjamin Graham. It is educational material, not investment advice.