Unit Economics

Scope. This article explains what unit economics measure, how the standard quantities are built, and how sensitive the headline ratio is to its assumptions. No threshold is given for any measure — where a conventional benchmark exists it is named as a convention and nothing is attached to it. The worked figures are an illustrative subscription business and are deliberately NOT the portal's canonical company, which is a manufacturer with no unit-level disclosure; they must not be treated as canonical or reused.

The unit varies — a customer, a subscription, a store, a vehicle, a delivery route — but the question is always the same: what does one of these cost to obtain, what does it contribute once obtained, and how long does it last?

The reason the aggregate accounts do not answer this is that they mix cohorts. An income statement shows the cost of acquiring customers who will contribute for years alongside the contribution of customers acquired years ago. A company growing quickly can therefore report losses while every individual unit is profitable, and a company that has stopped growing can report profits while its units are not. Unit economics exist to separate those two effects, and that separation is real and useful.

The four quantities

Contribution per unit per period — revenue from the unit less the costs that vary with serving it. Not gross profit exactly, and not operating profit: the costs that would disappear if the unit disappeared.

Cost to acquire — the sales and marketing spend attributable to winning the unit, conventionally the whole of that spend divided by the units won.

Retention, usually expressed as a churn rate per period, from which an expected lifetime is inferred.

Payback — how many periods of contribution it takes to recover the acquisition cost.

Where lifetime value comes from, and how fragile it is

Lifetime value is contribution multiplied by expected lifetime, and expected lifetime is almost always inferred as one divided by the churn rate. That inference assumes churn is constant over time and identical across customers — an assumption made for tractability rather than because anyone has observed it.

Worked example — one percentage point of churn removes a third of the value. Moving monthly churn from 2% to 3% cuts lifetime value from $3,500 to $2,333, a fall of 33.3%, and moves the ratio to acquisition cost from 2.92× to 1.94×. Nothing about the business changed except one input, measured over whatever history happened to be available. The fragility is structural rather than a defect of these particular numbers: because lifetime enters as the reciprocal of churn, the sensitivity of the output rises as churn falls, so the businesses that report the most attractive ratios are precisely the ones whose ratios are most sensitive to the estimate. MarketClue publishes no threshold for this ratio. A convention of comparing it to three exists in venture and technology commentary; this portal names the convention and attaches nothing to it, because the ratio's value depends entirely on an input the reader cannot verify.

The discounting problem

The standard calculation adds up contribution over an expected lifetime without discounting it, which treats a dollar received in month 50 as equal to a dollar received today. Applying the portal's canonical 9.0% cost of equity as a monthly rate of 0.75% closes that gap.

The closed form is contribution divided by the sum of the churn rate and the discount rate, which is worth knowing because it shows what the discount does: it behaves exactly like additional churn. The two are indistinguishable in the arithmetic — a customer who leaves and a dollar that arrives late reduce the answer through the same channel.

And the effect is largest where the headline number is largest, cutting the low-churn case by 27.3% against 15.8% for the high-churn one, because the low-churn case pushes more of its value further into the future.

The disclosure problem

None of this is audited and almost none of it is filed. Unit economics appear in investor presentations, earnings-call commentary and occasionally in the management discussion — not in the audited statements, because they are not accounting measures and have no standard definition.

Every quantity above involves a choice the company makes. Which costs count as variable determines contribution. Whether acquisition cost includes only paid marketing, or also sales salaries, brand spending and onboarding, can change it several-fold. Whether churn is measured by customer or by revenue, monthly or annually, blended or by cohort, changes the lifetime. Two companies with identical businesses can report materially different unit economics without either being wrong, because there is nothing for them to be wrong against.