The five numbers of the customer book

Most organisations cannot say what a single customer journey costs them to run badly, because the number has never been assembled and it is nobody's job to assemble it. This lesson assembles it, in five numbers.

1. Contribution — what a customer is worth

Start with the margin a customer actually contributes: revenue, less the direct cost of serving them. Not their revenue, and not an average — the specific contribution of the specific customer. Every other number is measured against this one.

2. Operational Burden — the cost of friction, in four pillars

Friction is not a feeling; it is a cost with four pillars. Support: the contacts, repeats and rework a broken journey generates. Payment: failed payments, chargebacks, collection effort. Operational: manual exceptions and workarounds that keep the process limping. Churn risk: the rising probability that this customer leaves. Add the four and you have the burden a customer places on the business.

3. The sentiment subsidy — what buys the score

Companies apologise beautifully for systems that keep breaking. Goodwill credits, repeat contacts and human rework quietly buy the satisfaction score, and the cost never appears on a CX dashboard. Name it and you can bound it — the Standard records it as a liability, not a virtue.

4. The Adjusted Profitability Ratio — is this customer solvent?

Set the burden against the contribution. When the burden approaches or exceeds the contribution, you are looking at toxic revenue: revenue that costs more to serve than it earns. It is real income on the top line and a loss underneath, and it is invisible until someone computes the ratio and assigns a tier.

5. The Churn Break-Even Point — how much goodwill is too much

There is a point past which retaining a customer costs more than losing them. The Standard makes it explicit, and bounds the goodwill you will spend before you stop. Below it, invest; above it, stop — and know the difference in advance rather than after the write-off.

That is the whole idea. You have just done what most dashboards never do: put a cost on friction, and separated the revenue that pays from the revenue that only looks like it does. The full five-part series walks each number with a worksheet you run on your own book.