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MarginLab Case Investigations
Illustrative case
Case 07 · Store contribution comparison

€100k Revenue Store vs €70k Revenue Store: Which Is More Profitable?

Store A reports €100,000 of net revenue; Store B reports €70,000. The larger store appears to have more room to invest. A consistent cost bridge reveals that the smaller business retains almost four times as much operating profit.

The business question

Which store generates more money after the costs required to produce its sales?

Initial evidence
CASE / 07
Store A revenue€100k1,000 orders
Store B revenue€70k700 orders
Store A operating profit€4k4.0% of net revenue
Store B operating profit€15k21.4% of net revenue
The investigationScale does not compensate for every difference in revenue quality and cost structure.
Investigation typeStore contribution comparison
Evidence basisConstructed dataset
Tax basisExcluding VAT/sales tax
OutcomeScenario-dependent
Methodology note: This is an illustrative ecommerce investigation, not a named merchant, observed customer result or guaranteed outcome. Both stores cover one month. Revenue headlines mean net product sales, excluding shipping charges and tax. COGS is net of recoverable returned inventory. Operating profit is before interest and tax.
Evidence 01 · Comparable revenue

Start with the same definition of sales.

The headline amounts are net sales after discounts and refunds. The two businesses have similar €100 net revenue per order, but arrive there through different gross sales and reductions.

Monthly revenue reconciliation; euros
MeasureStore AStore B
Gross product sales before discounts110,00075,000
Discounts(6,000)(2,000)
Refunded revenue(4,000)(3,000)
Net product revenue100,00070,000
Orders1,000700
Net revenue per order100100

The refund amounts are monetary reversals, not order-return rates. They are not enough on their own to infer customer experience or the number of returned parcels. Shopify’s sales reporting definitions provide a useful reconciliation starting point.

Evidence 02 · Contribution bridge

The larger store spends more to retain each euro.

Store A carries a higher product-cost ratio and much heavier acquisition burden. Its scale produces more revenue, but substantially less contribution.

From net revenue to operating profit; euros
MeasureStore AStore B
Net revenue100,00070,000
COGS, after inventory recovery(48,000)(28,000)
Marketing(25,000)(10,000)
Shipping and fulfillment(9,000)(5,000)
Payment fees(3,000)(2,100)
Return handling(1,000)(900)
Operating contribution14,00024,000
Fixed operating overhead(10,000)(9,000)
Operating profit before interest and tax4,00015,000
Return handling is an additional service cost. Refunded revenue has already been removed and recovered product value is already reflected in COGS, so neither is deducted twice.
Evidence 03 · Why the result changes

Store B retains €10,000 more before fixed overhead.

The €30,000 revenue advantage of Store A is overwhelmed by €40,000 of additional variable burden. Store A then has €1,000 more fixed overhead.

Profit difference: Store B minus Store A−€30,000 revenue + €40,000 lower variable costs + €1,000 lower overhead = €11,000

€15,000 − €4,000 = €11,000 more operating profit at Store B.

Finding 1

Product economics

Store A’s €48,000 COGS is 48% of net revenue. Store B’s €28,000 is 40%. This may reflect sourcing, pricing or mix; the totals alone do not identify the cause.

Finding 2

Acquisition burden

Marketing consumes 25% of net revenue at A versus approximately 14.3% at B. The gap warrants a cohort and incrementality investigation, not an automatic budget cut.

Contribution margins are 14.0% and approximately 34.3%. The smaller store’s advantage exists before the fixed-cost comparison, so overhead efficiency is not the main explanation.

Evidence 04 · What size still contributes

Store A is profitable, and its demand has value.

The analysis does not prove that smaller businesses are inherently better. Store A produces €4,000 of operating profit and may have capabilities or future demand absent from this one-month view.

Finding 1

Surface interpretation

More revenue and more orders make Store A look commercially stronger. Those facts remain correct.

Finding 2

Economic interpretation

Store B’s €15,000 operating profit gives it more current earnings capacity. Revenue is an input to this conclusion, not a substitute for the cost bridge.

Profit is not cash available for distribution. Inventory purchases, settlement timing, debt payments and tax can create a different cash outcome. This case compares operating economics only.

Decision test · Allocate the next growth effort

Compare incremental economics before copying either store.

Assume each store can add 100 orders at its current contribution per order, with €1,000 of additional fixed support cost. This is a sensitivity test, not an expectation that historical averages remain constant.

Illustrative 100-order expansion
MeasureStore AStore B
Current contribution per order€14.00€34.29
Contribution on 100 added orders€1,400€3,428.57
Additional support cost(€1,000)(€1,000)
Incremental operating profit€400€2,428.57

The expansion is more attractive at Store B under these assumptions. Its marginal acquisition cost, product mix and fulfillment capacity still need validation before committing spend. A profitable average does not guarantee a profitable next tranche.

Validation · Find the controllable cause

Use the bridge to choose a focused intervention.

For Store A, investigate the €15,000 marketing-cost difference and the COGS ratio before treating order volume as the solution. For Store B, test whether the contribution advantage survives expansion.

  1. Validate product-cost comparability

    Use consistent landed costs and inventory recovery. An incomplete cost record can manufacture an apparent advantage.

  2. Separate channel and customer mix

    Compare new and repeat customers, offer depth and cohort contribution. Avoid assuming the lower marketing ratio is entirely operational efficiency.

  3. Test a bounded change

    Choose one offer, audience or SKU set and measure contribution after mature returns. Preserve the original boundary.

  4. Reconcile operating profit to cash

    Before allocating the apparent surplus, include inventory commitments and payment timing in the cash plan.

The operating costs framework helps keep shared overhead separate from unit costs that move with additional orders.

Case conclusion · quantified decision

The €70k store earns €11,000 more operating profit.

Store B generates €15,000 versus Store A’s €4,000. The difference comes primarily from variable economics, not from having fewer orders or a dramatically smaller overhead base.

Headline corrected

Revenue is not earnings capacity.

Store A leads on sales; Store B leads on contribution and operating profit in this constructed month.

Quantified implication

The next 100 orders are not equally valuable.

At unchanged unit economics and €1,000 added support cost, the modeled profit increase is €400 at A versus €2,428.57 at B.

Choose growth opportunities by incremental operating profit, while testing whether the contribution assumptions survive scale.
Continue the investigation

Rebuild the operating result

Use net sales and a complete cost boundary before comparing store size or expansion opportunities.

All calculations are illustrative. The decision depends on the stated cost, demand and timing assumptions.