Strategy & Portfolio
Product-Market Fit
The stage where a startup's product strongly satisfies a genuine market need — characterized by organic growth, strong retention, and users who would be 'very disappointed' if the product disappeared.
Marc Andreessen defined product-market fit as 'being in a good market with a product that can satisfy that market.' Andy Rachleff and Sean Ellis operationalized it further: if 40%+ of users say they would be 'very disappointed' if they could no longer use the product, you have PMF.
PMF is not a binary switch — it exists on a spectrum, and companies can lose it as markets shift. Pre-PMF, almost everything is a waste of time. Post-PMF, almost everything works. The goal is to find PMF with minimal capital, then scale.
In Practice
Airbnb knew they had PMF when they saw hosts in New York spontaneously listing their apartments without being prompted — organic supply growth signaled that the product solved a real problem with real urgency. Conversely, many 'on-demand' startups had no PMF: they had to bribe both supply and demand to use the product.
Why It Matters
The most common early-stage startup mistake is scaling before achieving PMF — hiring sales teams before the product is proven, spending on marketing when retention is bad. Investors who fund pre-PMF companies are betting on the team's ability to find it, not on the current product.
VC Beast Take
PMF is the most cited and least well-defined concept in startup culture. Everyone claims to have it; very few actually do. Real PMF feels different: you can't hire fast enough, customers complain when you're down, and your biggest growth challenge is capacity, not acquisition.