Ask whether a stock is expensive while looking only at its price, and you have asked the wrong question. Cheap or dear is not an absolute number; it is a relative position. A flat seems pricey on its listing alone — until you learn what a similar unit in the same complex actually sold for last month. The judgment never lives in the asking price; it lives in the comparison. Yet in the stock market, most people stare at nothing but the listing.
The Misreading: Price as a Number
Treating valuation as an absolute number is where every misreading begins. A three-dollar stock is cheap, a three-hundred-dollar one is expensive — by that logic, everything cheap should be bought and everything expensive avoided. But cheapness has never been a reason to buy, nor dearness a reason to sell. Price is a number; valuation is a position. Those who confuse the two hold nothing but lonely numbers.
Three Axes of the Coordinate System
One framework puts the difference plainly: never judge a stock’s worth in isolation — build its coordinates first. There are three axes.
The first is the peer group. Same business, different price tags; the spread itself is information. The second is the historical cycle. Where has this stock traded at the top of a boom and the bottom of a bust, and where does it sit in the cycle now? The third is the overseas counterpart. Two companies with similar business models, and the market prices them miles apart — is that gap a mispricing, or is it justified?
None of these axes is a new invention; they are common sense applied to investing. Home buyers naturally look at recent transaction prices in the same community — nobody swipes a card based on the agent’s listing alone. But the moment they step into the stock market, people leave common sense at the door.
A few benchmarks to sketch the idea: Netflix against China Literature, for how the market prices IP value; China Merchants Bank against Postal Savings, for how much premium a retail bank deserves; Tesla against BYD, for how the valuation gap between EV makers opens up. The names are enough here — the detailed math is a separate course, not covered in this piece. Benchmarks are not for copying; they are for calibrating.
Cheapness Can Be the Price Tag of a Trap
Some say a low PB means cheap, and a stock trading below book value is a bargain waiting to be scooped up. That sounds like courage; it is actually the illusion of bargain hunting. Trading below book means the price sits under net assets — but net assets are a bookkeeping figure, and the books stay clean only if bad debts have been provisioned in full. Where provisions fall short, net value itself is inflated — and buying below book means paying for exactly that inflation. That is why one framework draws a hard line for banks: only stocks with a PB above one even enter the watchlist; anything below book is discarded outright. Cheapness can be the price tag of a trap — this targets not any particular stock, but the very act of bottom-fishing.
Another line surfaces in a downturn: this stock has never traded this low in its history. An all-time low sounds like a floor of iron, yet a valuation level on its own never serves as a basis for decisions. An all-time low without its coordinates is just a lonely number. To become a signal, two things must arrive together: a turning point in fundamentals, and market sentiment gone cold. Missing either one, a low is only a low, not an opportunity. Every strategic switch demands this double confirmation; a single valuation level does not qualify.
A third line is even breezier: who it gets compared against is up to me, isn’t it? Indeed it is — and so is the conclusion, at least when it’s wrong. Pick the wrong benchmark and the whole coordinate system collapses, taking every conclusion with it. Coordinates are homework, not excuses. Doing the homework means building all three axes and being able to justify each benchmark — not picking whichever reference conveniently proves the stock you want to buy is cheap.
Boundaries
Finally, the boundaries: nothing here constitutes investment advice; no stock recommendations, no price targets. Behind this coordinate system stands a larger framework — the other three of the four principles, which this piece does not touch; they belong to other essays. This piece answers one question only: how to read valuation.
Coordinates tell you where you stand, not where you are headed. Position right, direction still depends on fundamentals and sentiment. But flip it around: someone without a position is simply guessing when they talk about direction. That stock in your portfolio — is it expensive? First ask: compared to what?
