Say a bag from Harbor Coffee, our fictional coffee business, costs $5. Next week it is $5.15, beside a rival bag still priced at $5. Would you pay the extra 15 cents?
Your reason matters. You might trust the taste, follow a habit, or simply miss the price change. Harbor needs that preference to survive a rival's efforts to win you over. If a competitor can copy the reason you choose Harbor, the advantage may be short-lived.
What needs protecting
An economic moat is a lasting competitive advantage that protects returns above a business's cost of capital. Attractive returns give rivals a reason to compete. The moat makes their job difficult.
Harbor has something worth protecting. Its year 3 accounts show $220 million of operating profit on $1,100 million of revenue. That gives a 20% operating margin: $20 of operating profit per $100 of sales, matching years 1 and 2.
Using the earlier return on invested capital (ROIC) calculation, Harbor's returns hold near 23% across those three years, reaching 22.79% in year 3. Each clears the same hypothetical 9% hurdle.
DuPont analysis separated margin, asset use and financing. A moat claim goes further: it needs a reason rivals struggle, evidence that the reason works, and a threat that could undo it. A famous name, fast growth or sheer size does not prove protection.
Why customers stay or pay more
Brands, patents and licenses can create an intangible competitive advantage: protection through reputation or legal rights. It matters when it changes customer choices or limits what competitors can copy. The name on a bag earns its keep only if it changes what people choose or pay.
Pricing power means holding or raising prices without losing enough business to wipe out the benefit. Customers recognizing a logo is weaker evidence than customers paying for it; a famous brand can still lack a moat.
Switching costs are the money, time, disruption or risk involved in changing providers. Replacing software can require moving data and retraining staff. The pain of leaving can let the current provider charge more. A monthly subscription alone tells you little about that burden.
Harbor's customers can try another bag without moving data or retraining anyone; a shop customer may have an alternative around the corner. Liking a coffee does not lock you in.
Why rivals struggle to catch up
A network effect exists when a service becomes more useful as more relevant participants join. In a marketplace, more sellers give buyers more choice, while more buyers give sellers a reason to join. The users add value for each other. Opening more coffee shops does not, by itself, create that effect.
A structural cost advantage means lasting lower costs per unit than rivals. A hard-to-copy production process or distribution system can let a firm charge less or keep more profit at the same price. A temporary supplier discount is a saving, but rivals may get it too.
Efficient scale means a limited market offers too little business to justify another entrant's investment. A small port might have enough cargo for one terminal but too little to support building a second. The protection comes from the economics of entering that market.
These are Morningstar's five moat sources, with evidence to seek and a threat to consider for each:
| Moat source | Evidence to seek | Threat |
|---|---|---|
| Intangibles | Premiums or protected rights | Trust fades; rights expire |
| Switching costs | Costly migration | Easier transfers |
| Network effect | Users add value for others | Rivals attract key users |
| Cost advantage | Lower costs rivals cannot match | New production methods |
| Efficient scale | Too few buyers for new capacity | Cheaper entry |
Put Harbor's claim to a test
Harbor's brand claim runs through customer choice. Its accounts show strong returns, but the two customer links that would help explain them are missing:
Suppose Harbor raises prices 3% across all products, like the $5 bag becoming $5.15. Each product loses the same percentage of units sold, leaving the sales mix unchanged.
Apply the price-and-volume relationship to each $100 of starting sales:
- Units fall 2%: $103 × 0.98 = $100.94. Sales rise 0.94%.
- Units fall 5%: $103 × 0.95 = $97.85. Sales fall 2.15%.
Charging more can still mean collecting less. Neither result tells you what happens to profit: costs matter too, so Harbor's earlier 20% margin cannot simply be pasted onto these scenarios.
Repeat purchases at a premium to comparable alternatives would support the brand claim, especially across several periods without heavier discounts. Compare packaged coffee with competing bags and shops with nearby shops. A busy cafe cannot establish loyalty to the bags that supply most of Harbor's revenue.
Harbor's returns are attractive. Brand protection is plausible but unproven: we have no customer-response data. You can admire the returns without crediting the brand.
Look for the breach
The breach would be customers choosing cheaper bags unless Harbor discounts. That behavior would directly challenge the claim that its brand supports a premium. A useful moat claim tells you what would change your mind.
Higher bean costs could squeeze every coffee seller. That differs from Harbor losing buyers to a rival. A moat can survive a bad year for its industry; the competitive-analysis lesson explores those shared pressures in more depth.
Protection for existing returns still leaves you to judge whether new growth earns its keep. The next expansion has to justify the money it needs, even if the existing business is well defended.
In short
- A moat needs a durable mechanism that rivals cannot easily copy.
- Strong returns are evidence to explain, not a moat certificate.
- Habit, size and a famous name do not establish protection.
- A higher price can bring in less revenue; costs decide what happens to profit.
- A useful moat claim includes evidence that would change your mind.