The Biggest Issue with Product-Market Fit

27 Sept 2023 · 17 min
Founder's Journal

27 Sept 2023 · 17 min

0:00

In this solo episode of Founders Journal, Alex Lieberman critiques the myriad existing definitions of product‑market fit (PMF) for being vague and unmeasurable. He walks through well‑known definitions from Marc Andreessen, Elad Gil, Sam Altman, Brian Balfour, and David Sacks, highlighting their practical shortcomings. Seeking a universal, actionable metric, Lieberman introduces Sean Ellis’s “very‑disappointed” survey question and the 40% threshold as a cross‑industry indicator of PMF. He then details how Rahul Vora at Superhuman operationalized this insight with a four‑question survey, used segment analysis to focus on the most passionate user groups, and translated the feedback into a product roadmap that split effort between doubling down on the core benefit (speed) and addressing gaps for somewhat‑disappointed users. Throughout, Lieberman emphasizes the importance of measuring PMF, iterating based on concrete data, and resisting premature growth pressures. The episode concludes with resources for listeners to apply the framework to their own startups.

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