What makes a durable business
A business model describes how a company creates, delivers, and captures value. A competitive moat describes why competitors can't easily replicate or take that value away. Both matter for long-term equity valuation — a great business model without a moat will eventually see its economics competed away.
Warren Buffett popularized the moat concept. Moats come in several forms: brand strength (Coca-Cola, Apple), network effects (Visa, Mastercard, social platforms), switching costs (enterprise software like Salesforce, Oracle), cost advantages (scale, proprietary manufacturing), and regulatory protection (utilities, certain financial licenses).
The practical test: can a well-capitalized competitor enter this market and compete away the company's margins over 5-10 years? If yes, the moat is weak. If the answer is no — because of switching costs, network effects, or brand loyalty — you have a durable business worth paying a premium for.
A strong moat doesn't guarantee a good investment. A wonderful company at a terrible price is still a bad investment in the medium term. The most reliable wins come from finding strong moats at reasonable prices — not paying 50x sales for a business that may never earn enough to justify it.
Revenue model types
Subscription/recurring revenue models (SaaS, streaming, insurance) produce highly predictable, sticky cash flows. Once a customer subscribes, they tend to stay — making revenue forecasting easier and customer acquisition costs amortizable over a long relationship. The key metrics are ARR (annual recurring revenue), churn rate, and net revenue retention.
Transaction-based models (payments, e-commerce, marketplaces) scale with volume — their revenue grows proportionally with how much activity flows through the platform. Network effects often reinforce these models: more buyers attract more sellers, which attracts more buyers. But they can be highly cyclical in economic downturns.
Asset-heavy models (manufacturing, mining, utilities, real estate) require continuous capital reinvestment to maintain their earnings base. They often produce stable cash flows but limited growth and are heavily affected by commodity prices, interest rates, and depreciation.
Analyzing competitive position
Gross margins are the clearest signal of pricing power. A company maintaining 60%+ gross margins for years in a competitive industry has something rivals can't replicate — it's charging a premium that customers accept. Margin compression over time signals a weakening competitive position.
Research & development intensity (R&D as % of revenue) indicates how much a company is investing in its future competitive position. For technology companies, sustained high R&D as a percentage of revenue often predicts future product cycles. For mature companies, declining R&D can signal harvesting a business at the expense of future competitiveness.
Customer concentration is a moat risk. A company generating 40% of revenue from its top 3 customers has limited pricing power with those customers and significant earnings risk if any of them leaves. Diversified customer bases indicate genuine product-market fit rather than a few critical relationships.