Retention writing on cohort behaviour, churn diagnostics, dunning, reactivation and the compounding value of the second and third order.
Retention is where acquisition either compounds or evaporates. The commercial operating system behind repeat revenue in ecommerce, subscription and SaaS.
Whole-book averages hide when things get better or worse. Cohort analysis is the operator's default view for retention.
Churn work rarely fails for lack of ideas. It fails for lack of ordering. Here is a defensible sequence.
First order economics decide whether you can acquire. Second order economics decide whether you can grow.
Involuntary churn is not a mystery. It is a workflow — the one most subscription businesses under-invest in.