A moat is a hypothesis, not an outcome
An economic moat is a metaphor for a business defense that competitors may find difficult to copy. Brand, network effects, scale, switching costs, or unique assets can support customer retention and pricing power.
Evidence of an advantage
Test the story against durable numbers. Review multi-year margins, customer retention, repeat use, and how the company protects prices and costs when competition increases.
Cross-check financial results
A patent or market-share lead does not guarantee a lasting barrier. Note expiration, regulation, technology substitution, customer concentration, and the pace of competitor investment.
Look for erosion
Competitive-advantage analysis does not label a company permanently safe. Track the source of the advantage, its maintenance cost, and signs of weakening alongside actual results.
A hypothetical comparison
Imagine Company A has customer switching costs, while Company B retains customers mainly by offering a lower price. Even A’s advantage can weaken if product improvement stalls or regulation changes. A moat analysis should explain how an advantage may persist against competition, not merely point to a high margin today.
Where to verify the evidence
In annual filings, look for customer concentration, pricing drivers, named competitors, entry barriers, patent expirations, and supplier dependencies. Compare margins and returns over several years while separating asset sales or temporary price spikes. Whether an advantage exists and whether its price is attractive are separate questions.