Unit Economics
Unit economics is the per-order profitability math — revenue, variable cost, contribution margin, and payback — that decides whether scaling ad spend grows or shrinks your bottom line.
Unit Economics
The profit or loss generated per individual customer or order, after variable costs and acquisition spend.
Unit economics is the per-unit view of your business: how much money one order or one customer makes you after the costs that scale with each sale. The standard building blocks are revenue per order, variable cost of goods and fulfilment, contribution margin, customer acquisition cost, and the payback period that ties them together.
If the math works at the unit level, scaling spend compounds profit. If it doesn't, every extra order makes the hole deeper. That's why unit economics sits at the centre of any serious revenue intelligence practice — it tells you whether growth is worth buying.
At its simplest, unit economics asks one question: when you sell one more thing, does the business make money or lose it? You answer it by isolating the costs that move with volume — product, packaging, payment fees, shipping, returns, ad spend — from the fixed costs that don't.
Four numbers do most of the work. Average order value sets the revenue line. Variable cost per order strips out the cost of goods sold and fulfilment. Contribution margin is what's left to pay for acquisition and overhead. Payback period tells you how many orders or months it takes to earn back what you spent acquiring the customer.
Contribution Margin = AOV - COGS - Fulfilment - Payment Fees - Returns Reserve
AOV
Average Order Value
Gross revenue per order before discounts and refunds.
COGS
Cost of Goods Sold
Landed product cost per order.
Fulfilment
Fulfilment Cost
Pick, pack, and outbound shipping per order.
Payment Fees
Payment Processing
Card, wallet, and BNPL fees, typically 2-4% of AOV.
Returns Reserve
Returns Allowance
Expected refund and reverse-logistics cost per order.
A Shopify apparel store sells a €78 jacket and wants to know what's left to spend on acquisition.
AOV: €78.00
COGS: €24.00
Fulfilment: €7.50
Payment fees (3%): €2.34
Returns reserve (12%): €9.36
→ €34.80 contribution margin per order (44.6% of AOV)
With €34.80 of contribution per order, blended CAC needs to stay well under that to make a first order profitable — or the store needs repeat purchases to earn the rest back over time.
Healthy contribution margin varies sharply by category. Apparel and accessories sit in the 40-55% range once returns are taken seriously. Beauty and supplements often clear 60% on house brands but get squeezed on resold lines. Consumer electronics rarely top 25% — which is why those stores live or die on attach rate and warranty revenue.
Typical unit-economics benchmarks by online retail vertical (€100 order)
| Vertical | Contribution margin | Blended CAC | Payback (orders) |
|---|---|---|---|
| Apparel & accessories | 42-50% | €18-€28 | 1.0-1.5 |
| Beauty & personal care | 55-65% | €22-€35 | 0.8-1.2 |
| Supplements & wellness | 60-70% | €28-€45 | 1.0-1.8 |
| Home & lifestyle | 35-45% | €20-€32 | 1.5-2.5 |
| Consumer electronics | 18-25% | €15-€25 | 2.5-4.0 |
Read the table as a sanity check, not a target. The same store can sit in two rows depending on SKU mix — a beauty brand selling its own serum at 70% margin alongside a reseller fragrance line at 30% has to track unit economics by collection, not at the storefront level. Blended numbers hide the lines that are actually paying the bills.
Unit economics FAQ
Gross margin only subtracts cost of goods sold. Unit economics goes further by including fulfilment, payment fees, returns, and acquisition cost — so it reflects what's actually left after all the costs that scale with one more order.
LTV-to-CAC is the multi-order version of the same question. Unit economics on a single order tells you whether acquisition pays back immediately; LTV-to-CAC tells you whether it pays back over the customer's full lifetime, including repeat purchases and subscription renewals.
Most operators target payback inside the first order, or within 90 days. Subscription and replenishment brands can stretch to 6-9 months because repeat revenue is highly predictable. Anything beyond 12 months on a non-subscription store is usually a warning sign.
Yes, always. Returns are a real cost — reverse shipping, restocking, write-offs on damaged goods, and the refunded payment fee. In apparel, ignoring a 25% return rate can flip a profitable order into a loss-maker.
No. Unit economics is about variable costs that move with each sale. Fixed costs belong on the P&L beneath contribution margin, where you check whether total contribution covers overhead and produces operating profit.
Monthly at minimum, and any time you change pricing, shipping policy, ad mix, or supplier costs. Currency swings, freight surcharges, and Meta CPM spikes can move the numbers enough in 30 days to invalidate last quarter's plan.
Usually because the P&L blends new and repeat customers. New-customer orders carry the full CAC; repeat orders carry almost none. Looking at cohorts separately often reveals that paid acquisition is losing money even when the headline P&L looks fine.
A 20% sitewide discount usually cuts contribution margin by 35-50%, because the discount comes straight off the line with the most leverage. Welcome offers and bundles need to be modelled at the unit level before they go live, not just judged by topline conversion lift.
Unit economics is the profit lens on top of revenue intelligence. Revenue intelligence tells you which channels, products, and segments are growing; unit economics tells you which of them are actually worth growing. Without it, you optimise for revenue that loses money.
Yes — and most stores have more room here than they think. Lower returns through better PDP content and sizing tools, raise AOV with bundles and free-shipping thresholds, renegotiate 3PL and payment-processor rates, and cut CAC by shifting mix toward organic and email. Each lever moves margin by a few points.
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