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Re:Show HN: I created an algorithm to help me achieve Produc... by glaive123 on Wednesday October 30, 2019 @12:26PM (#21399455)
It's not weird at all. It's also called the "Must Have" Metric which defines if your product is a Must Have vs. Nice-to-Have. Must Have means your users can't live without it. This is the first state of Product/Market Fit. If you have can find a scalable channel then you have the second stage of Product/Market Fit.

Not all products need or have retention. Some amazing businesses are 1-time or products people pay for but don't need to use or actively engage with.

e.g. Universities, Courses = 1-time use Stocks/Investments = buy them and don't touch them until you sell Insurance = buy it and don't touch it until you renew 1 yr later Plenty of other examples

But every product should be a "Must Have" if it's going to grow.

Re:Show HN: I created an algorithm to help me achieve Produc... by koonsolo on Wednesday October 30, 2019 @01:54PM (#21400512)
But you need 40% of your "users" to qualify.

If I take all registerd people on my platform as "users", I might end up at 0,1%. But if I define a user as someone who is currently using my product >1 month, I might end up at 60%.

You are correct that not all products can have retention. But if you do, the cohort is a better metric in my opinion.