Practical stock researchModule 5, lesson 23 of 23
Case study: how a durable business compounds (a hypothetical consumer company)
A labelled hypothetical consumer company reinvesting at high returns for twenty years, showing how compounding works and why the price paid still matters.
In this lesson
- Explain how reinvesting at high returns on capital drives long-term growth.
- Show how the purchase valuation changes long-term returns from the same business.
- Explain why even excellent businesses suffer large share price falls along the way.
- Identify the evidence that a business can keep compounding.
Builds on
- Returns on incremental capitalCompounding depends on the returns earned on reinvested capital, explained there.
- Competitive advantages and their limitsHigh returns last only if a competitive advantage protects them.
On this page
In simple terms
The earlier case studies were failures. This one shows how success works, using a hypothetical company. It is not based on any real company; the numbers are made up to illustrate the principles. Real businesses rarely behave this smoothly.
The hypothetical company
Example Consumer Ltd, an imaginary maker of everyday household products, has:
- A strong brand and wide distribution, as the competitive advantage lesson describes.
- A return on capital of 30%, held for many years.
- A policy of reinvesting half its profits in new products, capacity and distribution, and paying the other half as dividends.
How compounding works
Growth from within a business is roughly:
Growth ≈ share of profits reinvested × return on the reinvested capital
| Reinvestment rate | 50% |
|---|---|
| Return on new capital | 30% |
| Growth in earnings: 0.5 × 30% | 15% a year |
| Earnings in year 0 | ₹100 crore |
| Earnings after 20 years: 100 × 1.15^20 | about ₹1,637 crore |
Earnings multiply about sixteen times in twenty years, while paying dividends throughout. This only works if the returns on new capital stay high, which the incremental returns lesson explains.
The price you pay still matters
Suppose that after twenty years the market values the company at 25 times earnings. Compare two investors who bought at different valuations.
Worked example: Same business, different prices
| Investor A | Investor B | |
|---|---|---|
| P/E paid in year 0 | 20 | 60 |
| Price paid (₹ crore of market value) | 2,000 | 6,000 |
| Value after 20 years at a P/E of 25 | about 40,900 | about 40,900 |
| Multiple of money | about 20 times | about 7 times |
| Yearly return before dividends | about 16% | about 10% |
Both bought the same excellent business. Investor B paid three times as much and earned a much lower return, because part of the business's growth was used up bringing the valuation down. At even higher starting valuations, returns can be poor for many years, as the valuation bubble case shows.
The falls along the way
Steady earnings growth does not mean a steady share price. Over twenty years, a hypothetical path might include:
- A 30% fall in a market-wide crash, despite earnings still rising.
- A 45% fall when a new competitor appears and investors fear the moat is broken.
- A 35% fall when valuations across the market compress as interest rates rise.
Each time, holding on required confidence in the business, and each fall would have tested the investor's risk tolerance and the habits described in the emotional decisions lesson. Many investors sell great businesses during such falls and miss the later compounding, as the volatility and drawdowns lesson explains.
Evidence to keep watching
The compounding story depends on a few things continuing:
- Returns on new capital stay high, not just returns on old capital.
- The competitive advantage holds, tested with evidence as the moats in practice lesson describes.
- Management allocates capital well, avoiding expensive acquisitions outside its strengths.
- Opportunities to reinvest remain; when they run out, growth slows and more cash should be returned.
These are the assumptions to monitor in a written thesis.
Why it matters
Great businesses that reinvest at high returns for long periods are among the most powerful sources of long-term wealth. But the price paid, the patience to hold through falls, and the discipline to check that the advantage is intact all decide whether an investor actually captures that wealth.
Limitations
This case is hypothetical and deliberately simple. Real companies face changing competition, management, regulation and markets. Few sustain such returns for twenty years, and identifying them in advance is much harder than recognising them afterwards.
Common mistakes
- Believing great businesses only go up.
- Paying any price for quality.
- Selling during temporary falls without checking whether the business changed.
- Assuming high returns last forever.
Try it yourself
- Change the reinvestment rate to 70% and the return on new capital to 20%, and recalculate twenty-year earnings.
- Recalculate both investors' returns if the final P/E is 15 instead of 25.
- For a real company you admire, find its return on capital and reinvestment rate over ten years, and estimate its internal growth rate.
Key takeaways
- Growth from within a business is roughly the share of profits reinvested multiplied by the return earned on that reinvestment.
- In this hypothetical case, reinvesting half of profits at 30% gives 15% yearly growth, multiplying earnings about sixteen times in twenty years.
- Buying the same business at 20 times earnings rather than 60 times changes the yearly return from about 16% to about 10% before dividends, if the P/E ends at 25.
- Even a business that compounds steadily can see its share price fall 30% to 45% several times over twenty years.
- The evidence to watch is whether returns on new capital stay high and the competitive advantage holds.
Check your understanding
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Terms used in this lesson
- Compounding
- Earning returns on your earlier returns as well as on the money you put in, so growth snowballs over time.
- Return on capital employed
- Operating profit (EBIT) divided by the capital provided by shareholders and lenders together, a measure of business quality little affected by debt.
- Drawdown
- The fall in value of an investment or index from its most recent peak, usually expressed as a percentage.
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This lesson is general education, not investment advice. Examples use made-up or clearly dated figures to explain ideas; they are not recommendations. Read the disclaimer.