Concept · Economics

Unit economics

Choose a unit that matches the decision, then include the revenues and costs that change when that unit is added.

One chosen unit reveals the revenue and costs that move with it.

“One customer” sounds precise until a business asks whether the customer means an account, a seat, a household, a transaction, or a customer-month. A delivery marketplace might model one completed order; a hotel might model one occupied room-night; a subscription service might model one retained account over a year. Each unit answers a different decision. Naming the unit, cohort, geography, and period is the first step, before calculating a margin or lifetime value.

In one sentence

Unit economics is an analysis of revenue and economically relevant costs for a precisely defined unit and time period, used to understand what changes as the business adds or serves that unit.

The second step is to identify the revenue and costs attributable to that unit. Variable costs move with activity; step costs change when capacity crosses a threshold; fixed costs remain for a relevant range and period. A unit model may include revenue, discounts, payment fees, materials, delivery, service labor, refunds, or commissions. It should say whether acquisition, implementation, shared engineering, and corporate overhead are included. Excluding a cost can be appropriate for a narrow incremental question, but not for a claim of overall profitability.

Unit economics is a lens, not a forecast. A positive contribution on today’s transactions does not prove the whole company can cover fixed costs or recover an acquisition investment. Conversely, a new cohort can appear unprofitable because it carries onboarding and acquisition expenses that pay back later. The useful analysis connects per-unit economics to capacity, customer retention, total demand, and the investments needed to reach the next scale.

Common units

Choose the unit that matches the cost driver and the decision in front of you.

Customer or account

Useful when acquisition, retention, service, and expansion are managed by customer cohort.

Transaction or order

Useful when price, fulfillment, returns, and payment cost move with each completed exchange.

Product, seat, or location

Useful when capacity, licensing, labor, or utilization is tied to a physical or contractual unit.

A continuum, not a switch

A company-wide average is easy to calculate but can hide differences. A decision-matched unit clarifies what changes with a customer, order, product, or location.

LowCompany-wide averageHighDecision-matched unit

“The unit is a modeling choice; the costs are an evidence question.”

Why it matters

DoorDash’s FY2024 filing defines Total Orders as completed orders across Marketplaces and Commerce Platform, while Marketplace GOV excludes Commerce Platform orders. Its Contribution Profit is an aggregate non-GAAP measure with specified expense adjustments. A division using these labels can therefore mix boundaries before addressing cost inclusion; read the units and numerator scope before presenting a per-order result.

Contribution Profit subtracts sales and marketing from gross profit and adds back specified items, including relevant depreciation/amortization, stock-based compensation and allocated overhead. This measures a defined operating layer. It neither includes every corporate cost nor estimates the avoidable cost of the next order. A positive contribution layer cannot by itself establish fully loaded company profitability.

Connect the next unit to the next commitment. A delivery may use spare route capacity at one demand level and require another shift or facility at a higher level. Define accepted service, location, mix and time, then compare the cost schedule in the range the proposal reaches. The historical average across all orders cannot determine that increment’s cost.

Real-world examples

The same concept shows up in different ways across industries.

DoorDashOrder counts and value measures have different boundaries

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DoorDash includes both Marketplaces and Commerce Platform in Total Orders but excludes Commerce Platform orders from Marketplace GOV. Its aggregate Contribution Profit has explicit adjustments. These disclosures support a perimeter check, not a fully loaded order-profit or marginal-delivery estimate.

When it breaks

The analysis misleads when an attractive unit is selected because it hides an expensive one. A restaurant can have positive order contribution while delivery and refunds make some channels uneconomic; a SaaS account can look attractive before implementation and support; a store can look profitable before central distribution costs. Show the stack of contribution layers and state which decisions each one can inform.

Averages also hide the shape of the distribution. New and mature customers may differ; large accounts can dominate a mean; peak and off-peak orders can have different costs. Report cohorts or ranges where possible. If the business changes pricing, fulfillment, or product mix, recalculate the unit instead of carrying forward a figure built under the old model.

Keep cash and recognition separate when the unit creates refunds, deferred revenue or advance payments. A contribution measure can be positive while financing needs rise. Use a cohort or transaction model for a specific decision and reconcile it with the total capacity, acquisition and central resources still required; no universal profitable-unit threshold follows from one issuer’s exclusions.

Key takeaways

01
Write the unit, cohort, period, and cost boundary beside the result.
02
Keep company-defined non-GAAP measures separate from standardized margin terms.
03
Link unit contribution to fixed costs, acquisition investment, and capacity.

Sources

DoorDash Inc. 2024 Form 10-K · DoorDash / SEC. Printed pp. 55–56, Total Orders and Marketplace GOV definitions, Contribution Profit definition; pp. 61–62, non-GAAP limitations and adjusted cost exclusions.