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What is CAC (Customer Acquisition Cost)?
by Wooden (2,800 points) | 5 views

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Customer acquisition cost or CAC should be the full cost of acquiring users, stated on a per user basis. Unfortunately, CAC metrics come in all shapes and sizes.

One common problem with CAC metrics is failing to include all the costs incurred in user acquisition such as referral fees, credits, or discounts. Another common problem is to calculate CAC as a “blended” cost (including users acquired organically) rather than isolating users acquired through “paid” marketing. While blended CAC [total acquisition cost / total new customers acquired across all channels] isn’t wrong, it doesn’t inform how well your paid campaigns are working and whether they’re profitable.

This is why investors consider paid CAC [total acquisition cost/ new customers acquired through paid marketing] to be more important than blended CAC in evaluating the viability of a business — it informs whether a company can scale up its user acquisition budget profitably. While an argument can be made in some cases that paid acquisition contributes to organic acquisition, one would need to demonstrate proof of that effect to put weight on blended CAC.

Many investors do like seeing both, however: the blended number as well as the CAC, broken out by paid/unpaid. We also like seeing the breakdown by dollars of paid customer acquisition channels: for example, how much does a paying customer cost if they were acquired via Facebook?

Counterintuitively, it turns out that costs typically go up as you try and reach a larger audience. So it might cost you \$1 to acquire your first 1,000 users, \$2 to acquire your next 10,000, and \$5 to \$10 to acquire your next 100,000. That’s why you can’t afford to ignore the metrics about volume of users acquired via each channel.

by Wooden (2,800 points)

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