3. Reinvesting: growing well or growing for the sake of it

Level 5: Competition and duration

So far you have seen why a high return is hard to keep up and what protects it when it does hold. The other half of the engine is still missing: what the company does with the money it earns. And this is where one of the most expensive mistakes in analysis lives, because growth has turned into a synonym for a good thing. It is not. Growth is an amplifier: it multiplies whatever you were already doing. If you reinvest above your cost of capital, growing makes you far more valuable. If you reinvest below it, growing impoverishes you faster.

Reinvesting is not a virtue, it is an investment decision

Every euro of profit the company does not distribute is a euro it has decided to invest in its own business rather than hand back. That decision is judged like any other investment: by comparing what it earns with what it costs. If money costs 8% and what you buy with it earns 5%, the deal is a bad one even if sales rise, even if total profit rises and even if the new factory is a thing of beauty.

Out of that comes the sentence that sums up the module: growth only creates value when the return on the new capital beats the cost of that capital. Below that line, growing destroys. Exactly that. Not neutral, not less good: it destroys.

Two companies with the same growth and opposite values

Let us take the numbers slowly, because this calculation is the heart of the level.

Company A and company B earn the same today: 120 million of after-tax operating profit. Both are going to grow at 6% a year. Both have a cost of capital of 8%. The only thing that separates them is what the new money they put in earns: A gets 20% on every euro reinvested and B gets 6%.

Growing 6% means adding 7.2 million of profit next year. How much has to be invested to get it?

• Company A. If every new euro earns 20%, it needs 36 million to generate that 7.2. It reinvests 36 of its 120 and has 84 million left over to hand to its owners.
• Company B. If every new euro earns 6%, it needs 120 million to generate the same 7.2. That is, its entire profit. It has nothing left to hand over.

Now put a price on them. A stream growing at 6% in perpetuity, discounted at 8%, is worth about fifty times that stream. A pays out 84 million a year and rising: of the order of 4.2 billion. B pays out zero: of the order of zero.

Same profit today, same growth, same sector, and one is worth billions while the other is worth practically nothing. The only difference lay in the return on incremental capital. And if B's incremental return were 4%, it would need 180 million to grow by the same amount, that is 60 more than it earns: it would have to borrow them or issue shares every year to fund growth that is making it poorer.

Average return and incremental return are not the same thing

This is the nuance that separates an analyst from a headline reader. The average return describes the capital already in place, much of which went in years ago under conditions that no longer exist. The incremental return describes the next euro, which is the only one being decided on today.

A magnificent company can have an average return of 22% and be putting its new money into projects that earn 6%, because its original business is already saturated and what is left to conquer is worse. When that happens, the average takes years to show it, and the value deteriorates long before the metric gives any warning. So when an investment is announced, the question is not how much this company earns, but how much it expects to earn on this particular money.

The empire problem

What is left to explain is why this happens so often, if the sum is so simple. The answer usually lies in the incentives.

• The prestige, the pay and the power of a management team depend far more on the size of the company than on its return on capital.
• Plenty of pay schemes reward growth in sales or in total profit, figures that almost always rise if you invest enough, whatever the money earns.
• Handing cash back to shareholders is read as a confession that you have run out of ideas, whereas a big acquisition makes the papers.

The result has had a name for decades: empire building. Companies that buy, expand and diversify not because the new money earns more than it costs, but because growing is comfortable for whoever decides. The warning sign is easy to check: a record of expensive acquisitions, a total profit that keeps rising and a return on capital that has been falling for years.

What it means for reverse-engineering the expectations

When you take a price apart, extracting the implied growth is not enough. You also have to extract the investment that growth demands and ask whether the business can put that much money to work at a decent return. A forecast that assumes high growth and a high incremental return for a long time is doubly demanding: it requires the company to find, year after year, opportunities that are large and profitable at the same time. That is far rarer than it sounds.

A real case: a decade of soaring output and negative cash

The US shale oil industry offers the cleanest example of growing while destroying value. Between roughly 2010 and 2019 American crude output more than doubled, an industrial achievement nobody disputes. Over that same period, the estimates circulating in the sector put the cumulative free cash flow of the producers as a group at hundreds of billions of dollars in the red: far more was invested than the business generated, and the difference was funded with debt and with share issuance.

Treat those figures as a magnitude, not as a settled number, because the estimates vary with who is doing the sums and which companies they include. What does not vary is the lesson: the growth was spectacular and real, and even so the capital invested did not cover its cost. An investor who had looked only at the production chart would have concluded the opposite of what the accounts were saying.