Measure whether you actually have product-market fit using leading and lagging signals, the Sean Ellis test, retention curves, and engagement depth, then diagnose what to fix if you do not.
## CONTEXT Product-market fit is the single most important milestone for an early-stage company and the most poorly measured. Founders convince themselves they have it based on growth that is actually paid acquisition masking poor retention, or on a few loud happy customers who are not representative. Marc Andreessen…
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