What Makes a Competitive Advantage Sustainable?

Advantage Is Easy to Claim

Every annual report and investor presentation describes a "strong competitive position." Strong brand, experienced management, market leadership, customer focus. If every company has an advantage, the word means nothing.

A useful definition is narrower and can be tested: a company has a competitive advantage if it earns returns on capital above its cost of capital, and keeps doing so for a long time despite competition. Everything else is a story until the numbers confirm it.

The Test: Returns That Last

In a competitive market, high returns attract rivals. They enter, add capacity and cut prices until returns fall back toward the cost of capital. This is called fade, and it is the normal state of business.

A sustainable advantage is something that slows or stops the fade. The questions to ask are:

• Does the company earn a return on capital well above its cost of capital?
• Has it done so for ten years or more, through good and bad periods?
• Can you name the specific reason competitors have not competed it away?

If the third answer is vague, the advantage may be luck or timing.

Five Sources That Tend to Last

1. Network effects. The product becomes more valuable as more people use it. Exchanges, payment networks and marketplaces are typical. A new rival must attract both sides of the network at once, which is very hard.

2. Switching costs. Customers find it costly, risky or tiresome to change suppliers. Core banking software, enterprise systems and specialised industrial inputs are examples. The product may not be the best, but replacing it is not worth the trouble.

3. Cost advantages. The company can produce or deliver more cheaply than rivals because of scale, location, process or access to raw materials. In industries like cement, plants near limestone and near markets have a lasting edge.

4. Intangible assets. Brands that let a company charge more, licences that limit competition, and patents. A brand counts only if it supports higher prices or loyalty, not just recognition.

5. Efficient scale. A market is only big enough to support one or two profitable players, so new entrants would make everyone unprofitable. Some infrastructure, depositories and regional utilities fit this pattern.

Things That Look Like Moats but Are Not

• High market share. Share can be lost quickly if it was won by price or by being first.
• Good management. Management changes, and good managers in a bad industry still struggle.
• Fast growth. Growth shows demand, not protection from competition.
• A popular product. Products can be copied.
• Being first. First movers often lose to better-funded followers.

A Worked Example: The Value of a Longer Advantage

Illustrative example. A company earns ₹100 crore of after-tax operating profit and grows 10% a year. While its advantage lasts, it earns 25% on new capital. Its cost of capital is 12%. Once the advantage ends, new investment earns only 12%, so further growth adds no value.

The same company, with the same current profit, is worth over 60% more if its advantage lasts 15 years instead of none. Much of what investors pay for in high-quality companies is not today's returns but the length of time those returns will last.

Measuring the Moat in the Annual Report

Some evidence of advantage can be read straight from the accounts:

• Stable gross margins through raw material swings suggest pricing power.
• Price increases above inflation without a fall in volumes suggest customers have few alternatives.
• Low and stable receivable days suggest the company sets the terms with its customers, not the other way round.
• Steady market share without rising marketing or discount spending.
• High returns on new investment, not just on old assets bought cheaply years ago.

A wide moat is also only as good as what management does with the cash it produces. A company that earns 30% in its core business and spends its surplus on unrelated acquisitions at low returns can destroy much of the value its moat creates.

Signs an Advantage Is Weakening

• Falling return on capital over several years, even if it is still high.
• Rising spending to hold market share, such as higher discounts, dealer incentives or advertising.
• Receivable days rising, which can mean the company is pushing stock to distributors or offering easier credit.
• New, well-funded entrants willing to accept low returns for years.
• Technology or regulatory change that lowers barriers to entry.

A recent Indian example of an advantage under test is decorative paints, where large new rivals entered in 2024 and 2025.

Habits for Judging Advantage

1. Calculate ROCE or ROIC for ten years, and compare it with the cost of capital.
2. Name the source of advantage in one sentence, using the five categories.
3. Look for evidence, such as pricing power, customer retention or cost per unit, not just claims.
4. Watch the warning signs each year.
5. Estimate how long the advantage might last, and test your valuation for shorter periods.

The Reframe

A moat is not what a company says about itself. It is what competitors have failed to take away. The width of the moat sets today's returns. Its durability sets most of the value.