AARRR (focusing on activation first)
RARRA (focusing on retention first, activation last)
If you invest $3000 to acquire 300 new users, and 95% leave by the end
of the month, then you have spent $3000 to acquire 15 users. Your Customer
Acquisition Cost (CAC) is $200.
if you invest $3000 to acquire 300 new users, but now only 70% leave by the
end of the month, then you have spent $3000 to acquire 90 users. Your Customer
Acquisition Cost (CAC) is $33.