Earnings power and reinvestment — the two engines

You can now separate price from value, and you know value is built from future cash. But that raises a deeper question the last two modules skipped over: where does the future cash come from, and what makes one business worth far more than another that earns the same profit today?

The answer is that value is powered by two engines, not one. The first is the cash the business already produces — its steady, present-day earning power. The second is what it can do with the profits it keeps: reinvest them to grow. Most beginners see only the second engine — "it's growing fast!" — and assume growth is always good. The truth is stranger and more useful: growth only creates value under one condition, and when that condition fails, growth can quietly destroy value even as profits climb.

This module takes the two engines apart, shows you the exact condition that decides whether the second one helps or hurts, and then — because this shelf insists on honesty — shows you why the second engine almost never runs at full power for long. Get this right and you will never again mistake a growing business for a valuable one.

Think of any business as a machine that turns capital into cash. Two separate things determine what that machine is worth.

Engine one: earnings power. This is the cash the business can produce as it is today, without growing at all — a stable, repeatable stream of free cash. If a company earns ₹100 cr of owner cash a year and could keep doing exactly that forever, it already has a value, computed just as in Module 1. This is its earnings power: the value of a business's current, sustainable cash if it never grew — the sturdiest, most reliable part of the worth, because it does not depend on any future bet paying off. Buffett's habit of valuing the owner earnings — the cash an owner could actually pocket — starts right here, with what the business throws off today.

Engine two: profitable reinvestment. A business does not have to hand all its cash to owners. It can keep some and plough it back — into new plants, new stores, new products — to earn more in future. This is the growth engine. But here is the twist that this entire module turns on: reinvestment only adds value if the money ploughed back earns more than it costs. Two numbers decide it:

• The return on capital: how many paise of profit the business earns for each rupee of capital put into it. (You will also see this called ROIC or ROCE.)
• The cost of capital, which you met last time as the discount rate — the return investors require for putting money into this business given its risk.

The rule is simple and it is the most important sentence in the module: reinvestment creates value only when the return on capital is higher than the cost of capital. Earn 20% on money that costs 12%, and every rupee reinvested comes back worth more than a rupee — growth builds value. Earn exactly 12%, and reinvestment is running to stand still — it adds profit but no value. Earn only 8%, and every rupee reinvested comes back worth less than a rupee — growth destroys value, even though profits are rising.

The amount of growth also depends on how much the business reinvests. There is a clean link: the growth rate equals the reinvestment rate — the share of profit ploughed back rather than paid out — multiplied by the return on capital. Reinvest 40% of profit at a 20% return, and the business grows at 40% × 20% = 8% a year. That single line ties the two engines together: how much you keep, times how well you deploy it, is how fast you grow.

Let us run the numbers, because the lesson only lands when you see the rupees. illustrative

Take a business earning ₹100 cr of profit a year, with a cost of capital of 12%. Start with engine one alone: if it pays out all ₹100 cr and never grows, its value is the familiar ₹100 cr ÷ 0.12 = ₹833 cr. That is its earnings-power value — the floor.

Now switch on engine two. Say it reinvests 40% of profit (so it pays owners ₹60 cr and ploughs back ₹40 cr) and we test three different returns on that reinvested capital. The growth rate is 40% × the return on capital, and the value of a growing cash stream is next year's owner cash divided by (cost of capital − growth rate).

Sit with that middle row for a second, because it is the one that surprises people. A business reinvesting 40% of its profit and growing at nearly 5% a year is worth exactly the same — ₹833 cr — as one that grows not at all. All that reinvestment, all that effort, and not one rupee of value added. Why? Because it earned exactly its cost of capital. It was running hard just to stay in place. And the bottom row is worse still: a business that keeps reinvesting and growing, but at a return below its cost of capital, is worth less than if it had simply handed the cash to its owners and grown not at all. Its growth is an engine running in reverse.

So growth is not good or bad in itself. It is a lever that multiplies the gap between return on capital and cost of capital. Where the gap is positive, growth is the most powerful value-builder there is. Where the gap is zero, growth is decoration. Where the gap is negative, growth is the fastest way to burn shareholders' money while looking busy.

Put two real-feeling businesses side by side. illustrative Both earn ₹100 cr and reinvest heavily. On a headline-growth screen they look like cousins. Underneath, they are opposites.

The first earns 22% on the capital it reinvests, against a 12% cost. That 10-point spread is the mark of a genuine competitive advantage — something (a brand, a network, a low-cost position, a switching cost) lets it earn far more than the money costs. Every rupee it retains and reinvests comes back worth well over a rupee, so the more it reinvests, the more value it builds. This is the fabled compounder: high returns, plenty of room to reinvest, value stacking on value.

The second grows just as fast on the headline, but it earns only 11% on reinvested capital, a whisker below its 12% cost. It builds new capacity, opens new outlets, reports rising profits — and creates no value doing it, perhaps a little negative. It is on a treadmill: reinvesting furiously to keep the profit line rising, while each new rupee of capital adds nothing to what the business is worth. To an investor reading only the growth rate, the two look alike. To one reading the return on capital against the cost of capital, they could not be more different.

The reading skill, then, is not to be dazzled by a growth number. It is to ask, every time: what does this business earn on the capital it reinvests, and is that comfortably above what the capital costs? A high, durable spread is the rarest and most valuable thing in investing. A thin or negative spread turns growth from a virtue into an expense.

The framework is clarifying, and it hides some genuine hard problems. Name them, so the neatness does not fool you.

It cannot promise the spread will last. This is the biggest limit, and it deserves its own principle. A high return on capital is not a fact of nature; it is a prize that competitors want. Unless something durable keeps them out, competition fades excess returns back toward the cost of capital. A model that assumes twenty unbroken years of 25% returns is usually assuming away the single strongest force in business. The honest question is not "how high is the return?" but "how long, and why, can it be defended?" — and that answer is a judgement about moats, not a number in a cell.

It cannot measure return on capital cleanly. The real figure is slippery — capital can be understated by old, depreciated assets or inflated by acquisitions and goodwill; a single good or bad year distorts it. The 20% in a spreadsheet may not be the true, sustainable return. Treat it as an estimate with its own error bars, like everything else on this shelf.

It cannot tell you the business will find places to reinvest. A wonderful 25% return is only worth having if the company can deploy meaningful capital at that rate. Many great businesses run out of high-return projects and must either lower their standards (destroying value) or return the cash. Reinvestment value assumes the runway exists; often it does not.

It cannot separate skill from luck in one year's numbers. A single year of high returns may be a cyclical peak, a one-off, or an accounting flatter — not durable earning power. The two engines are estimated from a business's normal, repeatable performance, which no single year reliably shows.

The two-engine view exposes the exact places beginners are misled by growth.

1. Treating all growth as good. Growth adds value only when the return on capital beats the cost of capital. Below that line, faster growth means faster value destruction — the opposite of what the rising profit line suggests.

2. Watching profit growth and ignoring return on capital. Profit can rise while value falls. The return on capital, set against the cost of capital, is the number that says whether the growth is worth having. Reading one without the other is reading half the story.

3. Assuming high returns are permanent. Excess returns are exactly what competition works to erase. A model that holds a fat return flat for decades is quietly assuming the business has no rivals — the most expensive assumption there is.

4. Confusing a lot of reinvestment with a lot of value. A business can reinvest heavily and add nothing if it earns only its cost of capital. Effort and capital spent are not value created; the spread over the cost of capital is.

5. Trusting a single year's return on capital. One year can be a peak, a trough, or an accounting artefact. Durable earning power shows up across a cycle, not in the latest annual figure.