Unit economics: how much you can pay for a customer

The most common reason ads «do not work» is not the settings. It is that the business cannot afford the customer it is buying. Four numbers show this, and most owners have never put them side by side.

Who needs this

• Ads are running, sales exist, but the bank balance is not growing.
• Your contractor reports a low cost per lead, yet profit stays flat.
• You want to scale budget and do not know where the safe ceiling is.
• You compare channels and cannot tell which one actually earns.
• You are just launching and do not know what budget makes sense at all.

What gets calculated

Metric	What it tells you
Average order value	What one buyer leaves per purchase
Margin	What survives after cost of goods, shipping and fees
Cost per customer	How much advertising buys one payment
Repeat purchase value	How often the same buyer returns and what that adds
Maximum viable CAC	The key number: above it, advertising runs at a loss

What to do when the numbers do not work

1. Raise the order value. Bundles, upsells, larger sizes. The fastest lever, because it needs no extra traffic.
2. Bring back existing buyers. A repeat purchase carries no acquisition cost, so it shifts the economics more than any campaign tuning.
3. Raise site conversion. The same ads with a page that converts twice as well halve the cost per customer.
4. Narrow the segment. Often only part of the catalogue is profitable, and that part is what should be advertised.
5. Accept that the channel is wrong. Also a result, and cheaper than six months of trying.

How the work runs

1. Collect the numbers: cost of goods, order value, fees, shipping, returns, repeat purchases over the available period.
2. Calculate the ceiling per segment, because it differs across the catalogue.
3. Check it against the auction: what a click and a lead actually cost in your niche and geography right now.
4. Deliver a verdict in money: what budget and channel make sense, and what has to change if none do.

FAQ

How is this different from an ad account audit?

An audit checks whether campaigns are set up correctly. Unit economics checks whether running them makes sense at all. A perfectly structured account can lose money consistently if the margin cannot carry the cost per customer.

I sell services, not products. Does this apply?

Yes, often more precisely, because services carry higher order values and longer cycles. Instead of cost of goods we count cost of delivery, and instead of repeat purchases we count repeat engagements and referrals.

What if it turns out ads cannot pay off?

That is the most valuable outcome available. From there you either change the economics or find another acquisition channel. Both are cheaper than continuing to spend.