Work out customer acquisition cost, lifetime value, the LTV:CAC ratio and how many months it takes to earn back what a customer cost.
CAC is sales and marketing spend divided by the new customers it brought. LTV is monthly gross profit per customer divided by monthly churn.
Payback is CAC divided by monthly gross profit per customer. The 3:1 rule of thumb is a convention, not a law; early on, a short payback matters more.
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