What is Product-Market Fit?
Product-market fit describes the degree to which a product satisfies strong market demand. Achieved when customers enthusiastically adopt, use, and recommend a product without heavy persuasion, it is the milestone after which scaling becomes viable. Without it, growth efforts are premature and unsustainable.
Marc Andreessen described product-market fit as "being in a good market with a product that can satisfy that market." You know you have it when customers are pulling the product from you rather than you pushing it. Quantitative signals include strong retention curves that flatten (not decline to zero), high Net Promoter Scores, organic growth through word-of-mouth, and decreasing CAC over time.
Sean Ellis proposed a simple survey: ask users "How would you feel if you could no longer use this product?" If 40%+ answer "very disappointed," you likely have product-market fit. Below that threshold, the product needs iteration before scaling.
In case interviews, product-market fit is critical for evaluating startup strategies and new product launches. Recommending aggressive marketing spend before achieving product-market fit is a red flag—you're essentially pouring fuel on a fire that hasn't started. The correct sequence is: find product-market fit first (through rapid iteration and customer feedback), then scale aggressively.
Real-world example
Airbnb iterated for two years before finding product-market fit. The breakthrough came when founders personally visited hosts in New York to improve listing photos, which dramatically increased bookings and proved the concept.
Related terms
Value Proposition
A value proposition is a clear statement of the tangible and intangible benefits a company delivers …
MVP (Minimum Viable Product)
A Minimum Viable Product is the simplest version of a product that delivers enough core value to att…
Go-to-Market Strategy
A go-to-market (GTM) strategy is the plan for launching a product or entering a new market, encompas…
NPS (Net Promoter Score)
Net Promoter Score measures customer loyalty by asking "How likely are you to recommend this product…
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