Three Lenses on Stock Value: Why Cash Is Still King

I'm Andy Temte and welcome to Money Lessons! Join me every Saturday morning for bite-sized lessons that are designed to improve financial literacy around the world. Today is May 16, 2026.

Last week we walked through the three risks of owning stock—firm-specific, market, and behavioral. Today we turn from "what could go wrong" to a different question: what is this stock worth? Notice I didn't ask what it costs. Cost and worth are not the same thing, and the gap between them is where investors win and lose. The practice of estimating worth is called valuation—our subject for today.

Returning to Ben Graham

We first met Benjamin Graham back in our November 1st episode on railroads—the father of value investing, the teacher who shaped Warren Buffett, and the man who insisted that a stock is fractional ownership in a real business. That insistence is the foundation of everything we'll cover today. If a stock represents a piece of a real business, then the business has a value that can be estimated based on what it owns, what it earns, and the cash it generates. That estimated value is one number. The price quoted on your screen this morning is another. The two are often close. Sometimes they're very different. Valuation is the practice of estimating what the business is worth so you can decide what to do about the price the market is quoting.

Three Lenses

Professional analysts use three primary lenses to estimate what a stock is worth. Relative valuation compares a stock's price to one of the company's underlying numbers—earnings, sales, or book value—and then compares that ratio to other stocks or to history. Asset-based valuation tallies what the company owns, subtracts what it owes, and sees what's left. Cash-flow-based valuation estimates the cash a business will generate over its lifetime, adjusted for time and risk. Each tells you something different, and most rigorous analysis uses all three. We'll survey them today, and save the math behind cash-flow-based valuation for a future series when we're ready to dig into present value.

Relative Valuation: The Most Accessible Lens

Relative valuation is where most investors start—it's accessible, intuitive, and the data is everywhere. The most famous tool is the price-to-earnings ratio, or P/E, which we introduced back in our April 18th episode on equity return metrics. Today we'll put it to work. Suppose Company A trades at $40 per share and earned $2 per share over the past year. Divide $40 by $2 and you get a P/E of 20. That means investors are paying $20 today for every dollar of last year's earnings. Now suppose Company B trades at $30 per share and earned $3 per share—a P/E of 10. On a P/E basis, Company B looks cheaper. You're paying $10 per dollar of earnings instead of $20.

But all else is rarely equal. Company A might be growing fast, with earnings expected to double in three years, which is why investors are paying more. Company B might be in a declining industry where earnings are expected to shrink. The P/E tells you what the market is paying. It doesn't tell you whether the market is right.

Two other multiples come up regularly. Price-to-sales—or P/S—divides price by revenue per share, and is useful when a company has no earnings yet. Price-to-book—or P/B—divides price by book value per share, and is most useful for asset-heavy businesses like utilities. Each multiple is a different angle on the same question: how much am I paying per dollar of something the company has? We'll come back to growth-versus-value investing in a later episode and look at how investors apply these ratios in practice.

Relative valuation has a strength and a weakness. The strength is that it's quick, comparable, and grounded in real numbers. The weakness is that the comparison group itself might be wrong. If every stock in the reference group is overpriced, then a stock that looks "reasonably priced" relative to that group is still overpriced.

When the Reference Group Was the Bubble

To illustrate, let’s go back to the dot com bubble. On March 10th, 2000, the NASDAQ Composite Index peaked at 5,048. The price-to-earnings ratio of the index at that moment was around 200—roughly ten times what's historically been considered normal. Many of the dot-com companies in the index had no earnings at all, and were valued instead on revenue, page views, or a story about future dominance. Pets.com, the most famous example, had a sock-puppet mascot, a Super Bowl ad, and no path to profitability. Its market value topped $300 million briefly.

By October of 2002, the NASDAQ had fallen 78 percent. About five trillion dollars in market value was wiped out. It took fifteen years for the index to reclaim its 2000 peak—not until April of 2015. Pets.com itself shut down in November of 2000, nine months after going public.

The lesson isn't that relative valuation is bad. The lesson is that relative valuation needs an anchor outside the comparison group. When investors compared one expensive tech stock to another expensive tech stock, they concluded everything was reasonably priced. The reference group was the bubble.

Asset-Based Valuation: What the Company Owns

The second lens is asset-based valuation. Tally up what a company owns—buildings, equipment, inventory, cash—and subtract what it owes. What's left is book value, what shareholders would theoretically receive if the company sold everything and paid off all its debts. It's most useful for asset-heavy businesses where value really does sit in physical things you can count. It's less useful for software companies or service businesses, where most of the value lives in people, brands, and intellectual property that don't appear on a balance sheet or show up as ‘intangible assets.’

Cash Is Still King

Now to the third lens and the principle that pulls everything together. A business, ultimately, is worth the present value of the cash it can generate over its lifetime. Not the earnings reported in any single year. Not the price the market is willing to pay this morning. The cash. Cash-flow-based valuation is the most rigorous lens because it asks the deepest question: how much cash will this business generate over time, and how does that cash eventually find its way back to shareholders? Some of it comes through dividends and buybacks—cash returned directly to owners. The rest gets reinvested in the business to grow future cash-generating capacity, which lifts the share price, which the investor ultimately realizes when they sell. Either way, cash is the engine.

Here's a critical thing to note. Stocks can trade at unhinged, speculative, completely disconnected prices for surprisingly long stretches—months, sometimes years. Speculation can run on stories, on momentum, on the conviction that a new technology has changed the rules. But speculation cannot run forever. Eventually the business has to generate cash, or the price will be revalued to reflect the cash that's there.

Pets.com—a business model that was before its time as evidenced by the current success of companies like Chewy—had no cash flows and never would. The unit economics—shipping heavy bags of pet food at a loss—couldn't work no matter how the business scaled.

In contrast, Amazon was also losing money and burning cash in the early 2000s. The difference was that Amazon's underlying economics were sound: a scalable retail model with improving margins as the business grew. Amazon turned its first profitable quarter in late 2001 and reached positive free cash flow in 2002. Same bubble. Very different fates. The companies that survived weren't the ones with the cleverest stories. They were the ones whose underlying business model could eventually produce cash flow—even if it hadn't yet.

What This Means for You

The takeaway isn't that you need to memorize ratios or run calculations on every stock you read about. It's more durable than that. Price and value can drift apart, and sometimes the gap stays open for a long time. When you read that a stock can't lose, or that a sector is different this time, or that traditional valuation no longer applies—the price has likely gotten ahead of the value, and a reckoning may be coming. When you read that a company is left for dead but the business is still generating cash, value may have moved further than the price reflects.

Next week we'll explore what happens when a private company decides to go public—the IPO process, what changes when shares first trade on an exchange, and what investors should understand about buying into a newly listed stock.

Until next week... Grace. Dignity. Compassion.