Economic Moat

Overview

An economic moat is the durable, structural competitive advantage that protects a business's returns on capital from being competed away. Popularized by Warren Buffett (1986 Berkshire letter); codified into five sources: intangible assets, switching costs, network effects, cost advantages, efficient scale. Greenwald's test: if you cannot name a specific mechanism that would cost a well-funded rival years and tens of millions to overcome, you have execution — not a moat.

Composes with network-effects and switching-costs (two moat sources, deeper treatment), porters-five-forces (industry-level; moat is company-level), margin-of-safety (wide moat × discount price = Buffett formula), lindy-effect (long survivors demonstrate moat durability).

When to Use

• Evaluating an investment, competitor, acquisition, or startup strategy for long-term defensibility
• Founder-board planning or investor pitch review around "what stops competitors"
• Someone says "moat," "defensibility," "competitive advantage," or "what stops competitors"
• Assessing durability amid the AI build-out — AI capex, chip export controls, "is the AI boom a bubble," or which infrastructure players (e.g. Nvidia/CUDA, TSMC) keep their returns

Not when: short time horizon; commoditized market (confirms "no moat"); question is immediate execution.

Coaching Novices (Adaptive Front Door)

• Engine mode: user has a specific business → run The Process directly.
• Coach mode: user is unfamiliar or has no concrete case → guide step by step.

In Coach mode, respond one step at a time. Each [WAIT] is a hard stop — output only that step's question, then stop.

1. One-line: a moat is a structural barrier — not great product or great team — that rivals can't easily replicate.
2. Check fit: is the time horizon multi-year? Is this an investment, strategy, or acquisition decision?
3. Elicit: what's the business and what is the claimed defensibility?

[WAIT — do not advance until user responds]

4. Run The Process one step at a time with their input.

[WAIT — do not advance until user responds]

5. Close: name moat width, trajectory, and operational implication.

[WAIT — do not advance until user responds]

The Process

Step 1 — Frame: Business · Industry · Time horizon · Claimed advantage · Financial signal (ROIC, gross margin, retention, pricing power).

Step 2 — Test 5 sources (present / absent / partial for each):

1. Intangible assets — brand, patents, regulatory license. Can a rival replicate in 5 years?
2. Switching costs — financial, time, data, integration, contractual. Dollar/hour cost to switch?
3. Network effects — user-to-user, two-sided, data flywheel. Past critical mass?
4. Cost advantages — scale, unique resource, proprietary process, location. Durable if rival scales?
5. Efficient scale — market too small to attract new entrants. Would structure tolerate entry?

Step 3 — Greenwald structural test: For each "present" source, articulate the mechanism in one sentence. "Great product / great team / first mover" do NOT pass. No articulable mechanism = no moat.

Step 4 — Trajectory: Widening / holding / narrowing? Evidence: ROIC trend, market-share trend, competitive-intensity trend over 3-5 years. Static wide-moat + narrowing trajectory = dangerous.

Step 5 — Smart-attacker test: Most-credible attack · Cost ($ + time) · P(success). >$100M + >5 years = wide. <$10M + <2 years = narrow or absent. Step 6 — Synthesize: Moat width (wide / narrow / none) · Primary source(s) · Trajectory · Duration of above-competitive returns · Operational implication.

Output

# Moat Analysis: <business>
Business / Industry / Time horizon / Claimed advantage / Financial signal
Five-source table: Source | Present | Structural mechanism | Evidence
Trajectory: widening / holding / narrowing — drivers
Smart attacker: attack / cost + time / P(success)
Assessment: width / primary source(s) / duration / operational implication

→ Method in Action: Buffett's See's Candies, 1972-present · Kodak's Film Moat Erosion, 1975-2012 → 2026 lens: Nvidia's CUDA & TSMC's process — the two deepest AI-supply-chain moats (2024–2026)

Pack: Moat Source Patterns

→ Primary sources: references/sources.md

Applying It Well

• Demand structural specificity — "great product / great team" never pass Greenwald.
• Evaluate trajectory first. Wide-but-narrowing (Kodak, Blockbuster) > narrow-but-widening in danger.
• Startups: identify which moat the model can credibly produce by year 5-10; invest in it deliberately.

Common Rationalizations

[D] = designed upfront | [O] = observed in real use. [O] entries are more valuable.

Red Flags

• Claimed moat fails Greenwald test; trajectory narrowing but analysis focuses on static width
• Business model has no moat-building mechanism — only execution advantage
• Smart-attacker test yields credible <$10M, <2-year attack
• Technology or regulatory shift reshaping market in ways static analysis misses
• Moat depends on a single key person rather than structural mechanisms

Verification

• All five sources tested; each "present" source has a structural mechanism (Greenwald)
• Trajectory assessed with evidence (ROIC, market share, competitive intensity)
• Smart-attacker test run with specific attack paths and cost estimate
• Moat width stated (wide / narrow / none) with estimated duration
• Operational implication stated; if startup, moat-building plan for years 1-5 articulated

Part of deciqAI Knowledge Skills — 227 open-source thinking skills that make rigor executable for AI agents. The same skills power every deciqAI agent, which runs them autonomously to operate your company. See it run → https://www.deciqai.com/c/economic-moat · ⭐ Star the repo → https://github.com/deciqAI/knowledge-skills · Contributions welcome.

Agents: latest version & machine-readable metadata → https://www.deciqai.com/s/economic-moat.json