Buffett: Moats, Owner Earnings, and the Long Term

Buffett studied under Graham but, under Munger's influence, made one crucial evolution: from "buying mediocre companies at cheap prices" (cigar-butts) to "buying wonderful companies at fair prices." One much-quoted line captures it all: "It is far better to buy a wonderful company at a fair price than a fair company at a wonderful price."

The Economic Moat

Buffett likens a company's durable competitive advantage to a "moat"—protecting the castle (high returns on capital) from attackers (capital that covets those profits). The wider and deeper the moat, the longer the business can sustain above-average returns.

• Intangible assets: brands (Coca-Cola), patents, licenses.
• Switching costs: it is costly for customers to leave (enterprise software, bank accounts).
• Network effects: the product becomes more valuable as more users join (exchanges, social platforms).
• Cost advantages: structurally lower costs from scale or geography (Costco, GEICO).

Owner Earnings

Buffett does not worship accounting net income; he cares more about "owner earnings": net income + non-cash charges such as depreciation and amortization − the capital expenditure needed to maintain the competitive position. This is closer to the cash a business can truly distribute to shareholders at its own discretion. A company with pretty profits but a constant need to pour in capital to sustain them may have very thin owner earnings.

“Time is the friend of the wonderful business, the enemy of the mediocre.”— Warren Buffett

The Long Term and Compounding

Buffett's ideal holding period is "forever." His money comes not mainly from valuation re-rating (buy low, sell high), but from the company's intrinsic value growing steadily over time and compounding ever larger. Frequent trading is slowly ground down by frictional costs and taxes, whereas holding a value-creating business for the long term lets the compounding machine run quietly.

How It Maps to Our Engine

The moat is the core of the "long-term assumptions." This platform separates "data refresh" (leaving long-term assumptions untouched, updating only short-term data) from "revision" (revaluing only when evidence shows the moat or long-term assumptions have changed)—the engineering of Buffett's thinking: daily volatility should not shake your judgment of a business's essence; only a genuine change in the moat warrants a revision.