A stock's price is what you pay, but its intrinsic value is what it's truly worth. These are rarely the same. The market price fluctuates based on news, sentiment, and trading algorithms. Intrinsic value, however, is an estimate of a company's worth based on its underlying financial health and future prospects. The goal of valuation is to calculate this intrinsic value to determine if a stock is overvalued, undervalued, or fairly priced.

There are two main schools of thought for finding this value. Absolute valuation models, like the Discounted Cash Flow (DCF) method, calculate value based on a company's own characteristics and cash-generating ability. Relative valuation, on the other hand, compares a company to its peers using metrics like the Price-to-Earnings (P/E) ratio. Mastering both gives you a powerful toolkit for making informed investment decisions.

The Discounted Cash Flow model is a cornerstone of absolute valuation. Its logic is simple: a business is worth the sum of all the cash it can generate in the future, discounted back to what that cash is worth today. After all, a dollar tomorrow is worth less than a dollar today. The process involves a few key steps.

First, you project the company's free cash flow (FCF) over a specific period, typically 5 to 10 years. This involves forecasting revenues, expenses, and investments.

Second, you determine an appropriate discount rate, usually the WACC or Weighted Average Cost of Capital. This rate reflects the riskiness of the investment and the cost of funding the company's operations through debt and equity.

Third, you have to estimate the company's value beyond the forecast period. This is called the Terminal Value, and it often represents a large portion of the total valuation. It's calculated using a perpetual growth rate or an exit multiple.

Finally, you discount the projected cash flows and the terminal value back to the present day using your discount rate. The sum is the company's estimated intrinsic value.

For stable, mature companies that pay regular dividends, the Dividend Discount Model (DDM) offers a more direct valuation method. It operates on the same principle as the DCF model but uses dividends as the measure of cash flow returned to shareholders.

The most common form is the Gordon Growth Model, which assumes dividends will grow at a constant rate forever. This makes it suitable for companies like utility providers or large consumer staples firms with predictable growth.

The DDM's simplicity is also its weakness. It can't value companies that don't pay dividends, and the entire valuation is extremely sensitive to the inputs for the discount rate ($r$) and the growth rate ($g$). A small change in either can drastically alter the result.

Relative valuation is less about calculating a precise number and more about seeing how a company stacks up. The most famous metric is the Price-to-Earnings (P/E) ratio. But simply saying a stock with a P/E of 15 is "cheaper" than one with a P/E of 30 is a mistake. Context is everything. You should compare a company's P/E to its own historical average and to the average P/E of its direct competitors or industry.

A more robust metric is EV/EBITDA (Enterprise Value to Earnings Before Interest, Taxes, Depreciation, and Amortization). This multiple is often preferred by analysts because it is capital structure-neutral. By using enterprise value, it accounts for both debt and equity. By using EBITDA, it removes the non-cash expense of depreciation and the effects of different tax rates, making it easier to compare companies with different financing and accounting policies.

In the table above, Company B looks cheaper on a P/E basis. But once you account for its large debt load using EV/EBITDA, you can see that both companies are valued identically based on their core operational earnings.

Valuation is an art, not a science. Your models are only as good as your assumptions. This is where the concept of a Margin of Safety becomes crucial. Popularized by Benjamin Graham, it is the principle of buying a security at a significant discount to your estimate of its intrinsic value.

If your DCF analysis suggests a stock is worth $100, you don't buy it at $99. You might wait until it's trading at $70. This 30% discount is your margin of safety. It provides a buffer against errors in your judgment, unforeseen negative events, or simply the bad luck that can plague any investment. It's the difference between speculation and disciplined investing.

By combining absolute and relative valuation techniques and always demanding a margin of safety, you can build a robust framework for identifying what a company is worth and why, setting the stage for more precise entry and exit timing.