Two Ways to Value Stocks: Firm Foundations vs Castles in the Air

Chapter 1 of A Random Walk Down Wall Street opens with an Oscar Wilde quote: “What is a cynic? A man who knows the price of everything, and the value of nothing.” That sets the tone for the whole book. Malkiel is about to spend hundreds of pages arguing that most people on Wall Street know the price of stocks but not their actual value.

And honestly? He makes a pretty strong case.

What Is a Random Walk?

First, the title. A “random walk” means that short-term stock price movements are unpredictable. You can’t look at yesterday’s price to figure out tomorrow’s. Chart patterns, earnings forecasts, expert predictions. None of it reliably tells you where a stock is headed next week.

Malkiel puts it bluntly: a blindfolded monkey throwing darts at stock listings could pick a portfolio that performs just as well as one picked by professionals.

Wall Street people hate this comparison. Obviously. Nobody in a pin-striped suit wants to be compared to a dart-throwing monkey. But that’s the claim, and Malkiel spends the rest of the book backing it up.

Who Is Malkiel, Anyway?

Before getting into the theories, Malkiel introduces himself. He’s not just some professor talking theory from an ivory tower. He worked on Wall Street at a leading investment firm. He chaired the investment committee of a multinational insurance company. He directed one of the world’s largest investment companies. And he’s been investing his own money his whole life.

He jokes that professors aren’t supposed to make money. It’s “unacademic.” But he’s clearly done well. The point is: this guy has skin in the game from both sides. Academic research and real-world investing experience.

Investing vs. Speculating

Malkiel draws a clear line here. Investing means buying assets for reasonably predictable income (dividends, interest, rental income) and long-term growth. You measure returns over years or decades.

Speculating means buying something hoping to flip it for a quick profit in days or weeks.

This book is for investors. Not speculators. As Malkiel puts it, a better subtitle would have been “The Get Rich Slowly but Surely Book.”

That’s not the sexy pitch most finance books give you. But it’s honest. And that honesty is what makes this book worth reading.

The Firm-Foundation Theory

Here’s the first big idea. The firm-foundation theory says every stock has an “intrinsic value.” A real, calculable worth based on what the company will earn and pay out in dividends over time.

Here’s how it works. You look at a company’s future earnings and dividends. Then you “discount” those future payments back to today’s dollars. If a company will pay you $1 next year, that’s worth about 95 cents today (assuming 5% interest rates). You could invest 95 cents now and have a dollar next year.

Add up all those discounted future payments, and you get the stock’s intrinsic value. If the market price is below that number, buy. If it’s above, sell. Simple.

John B. Williams laid out this framework in his book The Theory of Investment Value. But the idea really took off through Benjamin Graham and David Dodd’s classic Security Analysis. Their approach trained a whole generation of Wall Street analysts.

And then there’s Warren Buffett. He’s probably the most famous follower of this school. The “sage of Omaha” built his legendary track record by finding stocks trading below their intrinsic value and holding them.

But here’s the problem. Calculating intrinsic value requires predicting the future. How fast will earnings grow? How long will that growth last? Those are guesses, no matter how educated. When the market gets too excited about future growth, Malkiel jokes that stocks end up “discounting not only the future but perhaps even the hereafter.”

The Castle-in-the-Air Theory

Now the opposite approach. John Maynard Keynes, the famous economist, argued in 1936 that smart investors don’t waste time calculating intrinsic values. Instead, they try to figure out what the crowd will do next.

Keynes compared the stock market to a newspaper beauty contest. You’re shown 100 photos and have to pick the six prettiest faces. The winner is whoever picks the faces that most other people also picked. So you don’t pick the faces you think are prettiest. You pick the ones you think everyone else will pick. And then you realize everyone else is doing the same thing. So you try to predict what the average opinion thinks the average opinion will be.

It’s turtles all the way down.

By the way, Keynes practiced what he preached. He played the market from bed for half an hour each morning. Made millions for himself and grew the endowment of King’s College, Cambridge tenfold.

This theory says a stock is worth whatever someone else will pay for it. You buy at $50 not because it’s “worth” $50, but because you think someone will pay $60 next month. And that person buys at $60 because they expect someone to pay $70. The investment holds itself up by its own bootstraps.

Malkiel notes this is sometimes called the “greater fool” theory. It’s fine to pay three times what something is worth, as long as you can find someone to pay five times what it’s worth later.

Robert Shiller’s book Irrational Exuberance made this case for the late 1990s Internet bubble. Daniel Kahneman won the Nobel Prize in Economics for his work in behavioral finance, which is basically the academic version of this idea. Crowds can be irrational, and that irrationality moves prices.

Two Theories, One Market

So which theory is right?

The firm-foundation theory says: calculate real value, buy when cheap, sell when expensive. It’s methodical, numbers-driven, and patient.

The castle-in-the-air theory says: forget the spreadsheets, predict what the crowd will do. It’s psychological, fast-moving, and a bit cynical.

Malkiel doesn’t fully pick a side in Chapter 1. But he sets up the tension that drives the rest of the book. Both approaches have made people rich. Both have blind spots. And both will get tested against historical market manias in the chapters ahead.

There’s a Latin phrase Malkiel mentions that captures the castle-in-the-air view perfectly: “Res tantum valet quantum vendi potest.” A thing is worth only what someone else will pay for it.

Whether you agree with that or not probably says a lot about how you invest.

Previous: Why I’m Reading A Random Walk Down Wall Street Next: Tulip Mania, South Sea Bubbles, and Other Market Madness Part of the series: A Random Walk Down Wall Street Book by Burton G. Malkiel | ISBN: 978-0-393-08169-5