Obvious as it seems, I never got a good answer like that from "experts" about how to define PM fit. There were those guys talking about lean startup, measure e

Obvious as it seems, I never got a good answer like that from "experts" about how to define PM fit. There were those guys talking about lean startup, measure everything and stuff; but when come to this crutial question they were all "well, you will know when you have PM fit" or an arbitrary question with an arbitrary answer "ask your clients how disappointed they would be if your startup would shut down now; if 60% answer very disappointed, you have PM fit". So, similar key takeaway for me: "It is easy to be wrong about having Porduct/Market fit. Make sure your retention flat lines at the appropriate level."