Product-Market Fit

Product–market fit describes a product serving meaningful demand in a particular market. Andreessen popularized the concept in startup strategy. Evidence can vary by segment, use, pricing, and time; fit is not always obvious, binary, self-sustaining, or permanent.

Ask which product, which users, which circumstances, and which terms appear to fit. A service may be useful to one segment and unsuitable for another, or valuable when delivered manually but uneconomic at the proposed price. Evidence should cover actual use and continued choice, with delivery costs and acquisition conditions kept visible.

Fit is a judgment under uncertainty, not a permanent binary badge. Strong early enthusiasm can reflect novelty, exceptional support, or a narrow group. Track representative cohorts, understand why people remain or leave, and revisit the judgment when the product, audience, competition, or economics change.

When to use it

When building or iterating on products; when evaluating market opportunities; when deciding resource allocation; when scaling operations.

How it can help

Directly applicable to building, launching, and scaling products and businesses. Helps prioritize actions, identify market opportunities, and build sustainable competitive advantages.