The Numbers That Matter

Imagine two identical mango stalls sit side by side in the same market. Same mangoes, same seller-quality, same everything. The only difference is the price on the board. One stall charges ₹80 a dozen; the other charges ₹250 a dozen. Now ask a simple question: which stall is the good buy?

Every child in the market knows the answer instantly. The mangoes are equally good, so the good buy is obviously the cheaper stall. Nobody would say, "Well, both stalls have lovely mangoes, so both are good buys." The goodness of the mango and the goodness of the deal are two completely different things. A wonderful mango at a silly price is a bad deal, and a plain mango at a fair price can be a fine one.

This tiny idea - obvious with mangoes - is the whole secret grown-ups keep forgetting when they buy pieces of companies. They find a company they admire (good product, famous name, everyone loves it) and they leap straight to "so I should buy the shares." But admiring the company only tells you the mangoes are nice. It says nothing about whether the price on the board is ₹80 or ₹250. To know that, you have to look at a handful of plain numbers.

That is what this chapter is about. Not dozens of numbers - just a few that actually matter. And the single most important one is a way of asking: for how good this company is, is the price cheap, fair, or crazy? The rest of the numbers are safety checks that make sure the company won't fall over before the good story has time to play out. None of them need clever maths. They need only that you stop confusing "I like this company" with "this is a good buy."

Let's feel why this matters so much, because it's easy to nod along and then forget it the moment a shiny company appears.

When you buy a share, you are handing over a price today in the hope of getting more back later. What you eventually earn depends on two things: how well the business actually does, and what you paid to get in. People spend almost all their attention on the first thing and almost none on the second. That's backwards, because the price is the one part you completely control. You cannot make the company grow faster. You absolutely can refuse to overpay.

Here is the trap in plain terms. Suppose a company is genuinely excellent and its profits grow nicely for years. If you bought it at a fair price, that growth flows into your pocket. But if you bought it at a dreamy price - a price that already assumed years of brilliance - then the company can do everything right and you can still make almost nothing, because you already paid in advance for the good news. The business succeeded; your investment didn't. That gap between "the company did well" and "I did well" is created entirely by the price you paid.

So the numbers in this chapter aren't there to help you find "good companies." Finding companies you like is the easy part; the market is full of them. The numbers are there to answer the harder, less glamorous question: at today's price, is this good company actually a good buy, or have I been handed the ₹250 mango stall? Get that question right often enough and the years take care of you. Get it wrong - pay dreamy prices for lovely companies - and you can spend a decade being right about the business and still poor.

To ask "is the price cheap or crazy?" you first need a way to compare a ₹200 share with a ₹2,000 share, because the sticker price alone tells you nothing. A ₹2,000 share can be far cheaper than a ₹200 one. What we really want to know is: how much am I paying for each rupee of profit the company earns?

That is exactly what the P/E ratio measures, and despite the scary name it's just a small division. P stands for the price of one share. E stands for the earnings - the profit - the company makes per share in a year. Divide one by the other and you get the P/E.

Picture a company whose share costs ₹100, and in a year the business earns a profit of ₹5 for each share. Its P/E is 100 ÷ 5 = 20. Now here's a lovely way to feel what "20" means. Imagine you bought the whole tiny business for ₹100 and it handed you its ₹5 profit every year. How many years until those profits add back up to the ₹100 you paid? Twenty years. So a P/E of 20 is a rough way of saying, "at today's price and today's profit, it takes about twenty years of earnings to pay back what I put in." A P/E of 10 pays you back in about ten years; a P/E of 50 takes about fifty. Lower P/E, faster payback, cheaper-looking price. Higher P/E, slower payback, dearer-looking price.

So far, so useful. But now comes the catch that separates people who quote the P/E from people who actually understand it. A low P/E is not automatically cheap, and a high P/E is not automatically expensive. Because the payback clock is only counting today's profit - and companies don't stand still.

Here's the missing piece. The payback clock assumed the company earns the same ₹5 forever. But a company whose profits are growing pays you back faster than the clock suggests, because next year's slice is fatter than this year's, and the year after fatter still. A company whose profits are shrinking pays you back slower, or never. So the P/E on its own is half a sentence. To finish the sentence you must set it next to how fast the profits are growing.

This is the heart of the whole chapter, and it's beautifully simple. Compare the P/E number with the yearly growth-rate number. A rough, sturdy rule falls out: a fair P/E is roughly equal to the growth rate. If a company is growing its profits at about 20% a year, a P/E of around 20 is a fair price. If it grows at 40% a year, even a P/E of 40 can be fair. And if it barely grows at all - say 5% a year - then a P/E of 20 is expensive, no matter how famous the company is.

Grown-ups turn this into one tidy number by dividing the P/E by the growth rate. They call it the PEG. A PEG near 1 means the price and the growth match - fair. A PEG well below 1 (say 0.5) means you're paying less than the growth is worth - cheap, the ₹80 mango stall. A PEG well above 2 means you're paying far more than the growth can justify - dear, the ₹250 stall. Judge a P/E by holding it against the company's growth rate: a PEG near or below one is a fair-to-cheap price, while one well above two means you are paying up for growth that may never turn up.

Notice how much this fixes. It stops you calling a sleepy company "cheap" just because its P/E is low, and it stops you dismissing a fast-growing company as "expensive" just because its P/E looks big. The P/E alone was fooling you in both directions. The P/E against growth tells you the truth. This one comparison does more work than any other single number you will ever look at.

Let's put rupees on the table and watch the PEG idea sort out two companies that look identical to a careless eye. illustrative

Aarvi is looking at two businesses, and both happen to trade at a P/E of 30. To someone who only knows "a low P/E is cheap and a high P/E is dear," 30 and 30 look like the same price. Aarvi knows better and asks the second half of the sentence: how fast is each one growing?

The first is a maker of everyday snack foods. Its profits have grown at about 10% a year and are likely to keep plodding along at that pace. Hold its P/E of 30 against its growth of 10 and the PEG is 30 ÷ 10 = 3. That's a PEG well above 2 - Aarvi is being asked to pay for three years of growth to get one year's worth. At this price the snack company is expensive, however tasty its biscuits are.

The second is a small company that fits out kitchens for new flats, and its profits have been growing at about 30% a year as India builds homes. Same P/E of 30, but held against growth of 30 the PEG is 30 ÷ 30 = 1. That's a fair price - she's paying exactly what the growth is worth.

Same P/E, same ₹30-for-every-₹1-of-profit sticker, and yet one is dear and one is fair. If Aarvi puts ₹60,000 into each and both simply keep doing what they've been doing, the fair-priced kitchen company has room to reward her, while the expensive snack company needs everything to go right just for her to stand still. The number "30" told her nothing until she stood it next to growth. That is the entire lesson of the PEG in one small scene: the price is only cheap or dear relative to how fast the profit grows.

Now let's watch the PEG rescue a good buy that a lazy P/E rule would have thrown away. illustrative

Rohan is the careful sort who was taught, "never pay a P/E above 25 - that's always too expensive." A company crosses his desk: a maker of specialised medical testing kits. Its P/E is a scary-looking 45, and Rohan's first instinct is to reject it on the spot. Forty-five! Far above his rule of 25. Into the reject pile.

But he pauses and asks the growth question. This company's profits have been growing at about 45% a year, cleanly and for several years, as more hospitals across the country buy its kits. Hold the P/E of 45 against growth of 45 and the PEG is 45 ÷ 45 = 1. By the PEG's honest measure, this "expensive" company is fairly priced. Rohan's flat "never above 25" rule would have made him skip a fairly-valued fast grower while happily buying sleepy companies at a P/E of 20 that were growing at only 6% - a PEG of over 3, genuinely dear.

Here's the number that shows why the growth matters so much. A profit growing at 45% a year roughly doubles in under two years and grows more than sixfold in five. So the ₹100-of-profit you buy today is on track to become ₹600 in five years if the pace holds - which is why paying a P/E of 45 for it can make perfect sense, while paying a P/E of 45 for a company stuck at 5% growth would be madness. The very same P/E is a bargain in one case and a blunder in the other, and only the growth rate tells them apart.

Two warnings before you fall in love with the fast grower, though. First, that lovely PEG of 1 depends entirely on the 45% growth being real and repeatable. If the growth was a one-year fluke, the PEG is a mirage. Second - and Rohan holds onto this - a PEG of 1 says the price is fair, not that it's a gift. Fair means he's paying full value with no cushion if he's wrong. We'll come back to why that cushion is the difference between a fair buy and a safe one.

The PEG tells you whether the price is fair for the growth. But a fair price is worthless if the company falls over before the growth arrives. So before any yes, you check three plain numbers that answer a different question: can this business survive a bad year?

The first is cash - the money the company actually has in the bank. Cash is a cushion and a weapon. A company sitting on a big pile of cash can survive a lean stretch, grab an opportunity, and sleep at night. It's worth noticing that some of the price you're paying is really just that cash. If a ₹100 share belongs to a company holding ₹30 of cash per share, you're in a sense only paying ₹70 for the actual business - the cash is money in your pocket. Cash quietly makes a share cheaper than its P/E admits.

The second, and the more dangerous, is debt - money the company owes to others. Debt is the opposite of cash: it's a cushion working against you. A company with little debt has many bad years it can survive; a company drowning in debt might not survive even one. The simplest check is to compare what it owes with what it owns, or with what it earns. A company that owes far more than it earns in a year has handed control of its fate to its lenders. When the story goes wrong, it's almost always debt that turns a stumble into a collapse, because lenders must be paid whether or not the good times come.

The third is inventories - the unsold goods piled up in the warehouse. This one is a clever early-warning signal. If a company's stack of unsold goods is growing much faster than its sales, something may be quietly rotting: perhaps customers have gone cool and the goods aren't moving. It's like a baker whose unsold bread keeps piling up on the shelf - a sign the customers stopped coming before the accounts have caught up. Slowly it will have to cut prices to clear the pile, and the profit shrinks. Inventories growing faster than sales is a small yellow light that flickers before the bigger red one.

None of these three needs any maths harder than "is this bigger than that?" But together they answer the survival question the PEG can't: even at a fair price, will this business still be standing when the good years arrive?

Let's watch the safety numbers do the thing the PEG alone cannot. illustrative

Haridya finds two companies, both makers of building materials, and both - happily - priced at a fair PEG of about 1. The P/E on each is 18 and each grows profits at roughly 18% a year. On price alone, they're twins. She could flip a coin. Instead she opens the safety numbers.

The first company holds ₹25 of cash per share against its ₹150 share price and owes very little - its debts are smaller than a single year's profit. Its warehouse of unsold goods has been growing slower than its sales. Everything about it says: this business can walk through a bad year without flinching.

The second company, at the same fair PEG, tells a darker story underneath. It holds almost no cash, and it owes nearly four years' worth of its profit to lenders. Worse, its pile of unsold goods has been swelling faster than its sales for a while - a quiet sign that demand may be cooling even as the profit line still looks fine. The fair price hides a fragile body.

Now suppose a slow year arrives - building slows down for a while, as it sometimes does. The first company shrugs: cash in the bank, few debts to service, lean inventories. It survives easily and is still there when building picks up again. The second company can't service its heavy debt out of a shrunken profit, is forced to dump its swollen inventory at a loss to raise cash, and may have to borrow on worse terms just to stay alive. Same fair price going in; wildly different fates. If Haridya had judged only by the PEG, she'd have seen two identical "fair buys." The cash, debt, and inventory numbers were the difference between a fair buy and a survivable one - and only one of them earns her ₹70,000.

Now the deepest point in the chapter, the one that keeps all these numbers from becoming a trap of their own. A number is never the answer by itself. It's only a clue, and a clue only makes sense inside the story of the company. The same number can be wonderful in one business and terrible in another. A figure means nothing on its own; it only tells the truth inside the company's story, so always ask what has to be true about the business for this number to be real and to last.

Take that lovely PEG of 1 built on 40% growth. It's only lovely if the 40% is real and repeatable. Ask the story behind it. Is the profit growing because more and more people genuinely want what the company sells - a story that can continue? Or did profit jump 40% in a single year because the company sold off a building, or because one giant one-time order landed, or because of an accounting change that makes this year look fat? If the 40% is a one-off, then next year's growth might be 5%, the real PEG is closer to 8, and the "cheap" company was a mirage all along. The number was honest; the story you told about it was a lie.

The same goes for every number here. A pile of debt is frightening in a company whose sales bounce around wildly and comforting in a boring one with steady, predictable income that can always cover its payments - the debt number is identical, but the story around it flips its meaning. A mountain of inventory is a warning for a fashion company whose styles go stale but perfectly normal for a firm that must age its product for years before selling it. A low P/E can mean "bargain" or it can mean "the market knows something bad is coming that this year's profit hasn't shown yet" - and only the story tells you which.

So the habit isn't "collect the numbers and obey them." It's "let the numbers ask you questions about the business, then go find out whether the story holds." When you see a dazzling PEG, don't celebrate - get suspicious, and ask what has to be true for it to be real. When you see a frightening debt figure, ask whether this particular business can carry it. The number points a torch at the right question. The story is where the answer lives. People who forget this end up fooled by their own spreadsheets, mistaking a tidy decimal for a truth.

The slips here are rarely about the arithmetic. They're about forgetting what the arithmetic is for.

The commonest slip is quoting a P/E as if it settles anything. Someone says "it's only a P/E of 12, it's cheap!" and buys - never asking whether the company is growing at all. A P/E of 12 on a business whose profits are shrinking isn't cheap; it's a warning that the market expects worse. The P/E was never the answer; it was half a question. The other half - the growth, and the story behind the growth - is where the truth was hiding the whole time.

The second slip is falling in love with a gorgeous PEG built on a number you never checked. A PEG of 0.5 looks like a gift, so people pounce without asking the one question that matters: is the growth real and likely to last? When the dazzling growth turns out to be a one-year accident, the gift becomes a bill. The prettier the number, the harder you should squint at the story behind it.

Now the honest limits, because even the best numbers can be pushed until they lie.

First, the PEG rule is a rough sanity check, not a precise machine. It is brilliant at catching the big, obvious errors - the sleepy company priced like a rocket, the genuine grower dismissed on a scary P/E. But do not treat a PEG of 0.9 as clearly better than one of 1.1; they're the same answer, "roughly fair." The tool is a blunt instrument that keeps you out of the ditch, not a fine ruler that measures the last centimetre. Anyone quoting a PEG to two decimal places has forgotten how rough the growth guess underneath it really is.

Second, the growth number is the softest brick in the wall, and the whole PEG rests on it. Past growth is a fact; future growth is a guess dressed up as a fact. A company can grow at 40% for three years and 4% for the next ten, and no formula sees the wall coming. The very fast growers that make the PEG look most tempting are often the ones whose growth is least reliable, because fast growth attracts rivals and fills up markets. So the faster the growth you're relying on, the more suspicious - not less - you should be of the tidy PEG it produces.

Third, and this is the deeper caution: these numbers describe the past and the present, and you are buying the future. Cash, debt, inventory, P/E, growth - every one is a photograph of what has already happened. They're the best clues you have, but they are clues, not guarantees. A company can look flawless on every number and still be quietly walking into trouble the accounts haven't recorded yet. That's precisely why the story matters more than any single figure, and why you leave yourself a cushion. The numbers narrow the odds beautifully in your favour. They never remove the chance of being wrong. And when the chance of being wrong can never reach zero, the only sane reply is to never pay so full a price that being wrong ruins you - to buy fair companies at less than fair prices whenever the market's fear lets you, so that even a mistaken guess leaves you standing.