The more useful and much much important metric to understand is marginal contribution and your marginal CAC.

In the illustration you roughly have a $90 CAC for 0-10k and 10k-20k in spend. However the CAC average change to $100 which means for the spend of 20k-30k you paid $110 for those conversations. You then have to understand the business unit economics to ensure that on that marginal acquisition is profitable ( keeping in mind we are past the growth at all costs days and capital is expensive).

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