A units-lost count tells a factory or a buyer that something went wrong; it does not tell anyone whether that loss is a rounding error against the order's total value or a serious dent in the profit the order was supposed to deliver. An agent representing a buyer needs the second kind of number, because the agent's own job is to protect the buyer's commercial interest across the whole order, and "60 units are missing" means something very different on a 15,000-piece order than it would on a 500-piece one.
This lesson gives you the calculation that turns a confirmed shortfall, already sorted into its cause in Lesson 3.3, into a share of an order's own planned margin. You will apply it to Meridian Sourcing, the agent representing two European buyers on a mixed Make to Order and Make to Stock account, using Order A's own fixed FOB and margin figures as the reference.
You need: how to sort a confirmed variance into theft, damage or administrative error (Lesson 3.3), and Order A's own fixed cost breakdown (docs/02 section 7).
By the end of this lesson you can:
Not covered here: identifying the cause of a shortfall (Lesson 3.3), or building the full tracker workbook (Lesson 3.5). This lesson only teaches the margin-cost calculation.
| Term | Meaning |
|---|---|
| Cost of inventory inaccuracy | The share of an order's own planned margin lost to units the book stock claims exist but that are not actually there to sell. |
| Planned margin per unit | The profit component built into a piece's agreed price, before any inventory loss is applied against it. |
| Total planned margin | The planned margin per unit multiplied by the order's full confirmed quantity, the profit the whole order was designed to deliver. |
| Share of margin lost | The margin lost to a confirmed shortfall, divided by the order's total planned margin, shown as a percentage. |
| Margin | Profit divided by the selling price, shown as a percentage of what a company sells for. |
| Hybrid account | A buyer relationship that combines Make to Order and Make to Stock business with the same factory. |
An order's total value and its planned margin are two different numbers built from the same price. Order A's agreed FOB of USD 3.20 per piece already contains fabric, trims, making, overhead and profit as separate components (docs/02 section 7); when a unit goes missing, the factory and the buyer do not simply lose USD 3.20 of activity, they lose the profit component that unit was supposed to contribute, because the fabric, trims and making cost for that unit were typically already spent before it disappeared. Measuring a shortfall against total order value understates how much of the loss actually falls on profit; measuring it against planned margin shows the real damage.
| What can differ | The shapes you meet | Why it matters to you |
|---|---|---|
| Who bears the loss | On an FOB order like Order A, the factory has usually already been paid or is close to payment once goods ship, so a shortfall discovered downstream, at a distribution centre or a shop, falls on the buyer's or the agent's own commercial result, not the factory's. | The party asking "what does this cost me" needs the margin figure relevant to their own position in the chain, not a generic total. |
| Business model | A Make to Order shipment's margin is fixed at the point the order was priced; a Make to Stock or hybrid account's margin can shift with markdowns taken later in the season, so the same unit lost early in the season costs more margin than one lost after a markdown. | The timing of a loss inside a hybrid account's own selling season changes how much margin that loss actually erodes. |
| Agent's own commission | Meridian Sourcing earns a 5% commission on the orders it represents (docs/02 section 6); a shortfall that reduces the buyer's realised sales also reduces the commission base the agent earns from, giving the agent its own direct reason to track the cost of inaccuracy. | An agent's incentive to investigate a shortfall is not only the buyer's interest; the agent's own commission is tied to the same number. |
| Market | An export order's margin is usually calculated in a single agreed currency, such as Order A's USD price; a domestic Make to Stock chain may also need to account for a local currency's own movement against a foreign-currency cost base. | The currency the margin is measured in should match the currency the business actually plans and reports in. |
| Scale of the order | The same 60-unit shortfall is a small share of a 15,000-piece order like Order A but a much larger share of a smaller repeat order. | The share of margin lost, not the raw unit count, is what tells you whether a shortfall is minor or serious. |
Meridian Sourcing represents two European buyers on a hybrid account with Delta Garments, earning a 5% commission on the business it places (docs/02 section 6). One of those buyers takes delivery of Order A's T-shirt, 15,000 pieces at the agreed FOB of USD 3.20 per piece, which already includes a profit component of USD 0.26 per piece (docs/02 section 7). A shortfall of 60 units is confirmed at the buyer's own European distribution centre, already sorted in Lesson 3.3's method into a mix of administrative error and unknown shrinkage.
Meridian's own commercial interest in this number is direct: a smaller realised sale from the affected units also means a smaller commission base for Meridian itself, on top of the buyer's own lost margin.
The worked numberMeasured against Order A's total FOB value of USD 48,000 (15,000 × USD 3.20), the 60 missing units at USD 3.20 each would look like USD 192, already a small figure. Measured correctly against the order's own USD 3,900 total planned margin, the real cost is USD 15.60, or 0.4% of the margin the whole order was built to deliver. Both figures are small here, which is itself the useful finding: this particular shortfall does not justify a large investigation, but the method is what lets Meridian say that with confidence instead of guessing.
Multiplying missing units by the full FOB or retail price overstates the loss, because much of that price was already spent on fabric, trims, making and overhead before the unit disappeared; that cost is already gone whether the unit is sold or not. Reporting the inflated, full-price figure can trigger a disproportionate response, such as an expensive security overhaul, for a loss that a correctly calculated margin figure would show as minor, or it can understate a genuinely serious loss on an order with a very thin margin, where even a small unit count represents a large share of the profit at stake.
When stock goes missing, do not simply multiply the missing units by the full price to say what it costs. Most of that price was already spent making the piece before it disappeared. What is actually lost is the profit slice built into the price, so multiply the missing units by that profit slice instead, then compare the result to the total profit the whole order was supposed to earn. That comparison tells you, as a clear percentage, whether a shortfall is a rounding error or a real dent in the order's own result.
Three months after the 60-unit shortfall, the same European distribution centre confirms a second shortfall of 900 units on a later, smaller repeat order of the same T-shirt style, 3,000 pieces at the same USD 0.26 planned margin per unit.
Should Meridian judge the new shortfall as roughly the same seriousness as the first one, since both involve the same style and the same margin per unit? Decide before opening the answer.
No. Meridian should calculate the new shortfall's share of its own order's margin, which shows it as far more serious than the first, and this justifies raising a formal request for a security review.
1. The new shortfall's margin lost is 900 × USD 0.26 = USD 234, against a total planned margin for the smaller order of 3,000 × USD 0.26 = USD 780, a share of 30%. 2. The first shortfall's share was 0.4% of Order A's own margin; the new share of 30% is roughly 75 times larger, even though the unit count only grew about 15 times, because the smaller order has far less total margin to absorb the same kind of loss. 3. A 30% share of an order's own planned margin is large enough to justify formally requesting a security review at the distribution centre, rather than logging it as routine shrinkage.
Comparing raw unit counts across two different order sizes would have hidden how much worse the second shortfall actually is; comparing the share of each order's own margin makes the difference in seriousness immediately clear.
Meridian Sourcing earns a 5% commission on the business it represents (docs/02 section 6). Applied to the value of the units actually lost from Order A's shortfall:
USD 9.60 is a small figure on its own, consistent with this shortfall's overall minor scale, but it illustrates why an agent's interest in tracking the cost of inventory inaccuracy is not purely on the buyer's behalf: every unit lost to shrinkage anywhere in the chain also reduces the commission base the agent's own income depends on.
Use the T21-C03 Inventory accuracy and shrinkage tracker workbook, "Cost of inaccuracy on margin" sheet. For each confirmed shortfall, record the order reference, the units affected, the planned margin per unit, the order's own total planned margin, and let the sheet calculate the margin lost and its share. Start with Meridian's Order A example above, then add a shortfall of your own.
[Download the Inventory accuracy and shrinkage tracker workbook](../../templates/T21-C03-inventory-accuracy-shrinkage-tracker.xlsx)
Download the Inventory accuracy and shrinkage tracker (Excel)
1. Why is a shortfall's cost measured against an order's planned margin rather than its full selling price?
2. 60 units of Order A are missing, each with a planned margin of USD 0.26, on a 15,000-piece order with a total planned margin of USD 3,900. What share of margin is lost?
3. A repeat order of 3,000 pieces loses 900 units at the same USD 0.26 planned margin per unit. What share of that order's own margin is lost?
| EN | AR | FR | TR | Meaning |
|---|---|---|---|---|
| Cost of inventory inaccuracy | تكلفة عدم دقة المخزون | Coût de l'imprécision des stocks | Envanter hatasının maliyeti | The share of an order's own planned margin lost to units the book stock claims exist but that are not actually there to sell. |
| Planned margin per unit | الهامش المخطط للوحدة | Marge prévue par unité | Planlanan birim marj | The profit component built into a piece's agreed price, before any inventory loss is applied against it. |
| Total planned margin | إجمالي الهامش المخطط | Marge totale prévue | Toplam planlanan marj | The planned margin per unit multiplied by the order's full confirmed quantity, the profit the whole order was designed to deliver. |
| Share of margin lost | نسبة الهامش المفقود | Part de la marge perdue | Kaybedilen marj payı | The margin lost to a confirmed shortfall, divided by the order's total planned margin, shown as a percentage. |
| Margin | الهامش | Marge | Marj | Profit divided by the selling price, shown as a percentage of what a company sells for. |
| Hybrid account | حساب مختلط | Compte hybride | Hibrit hesap | A buyer relationship that combines Make to Order and Make to Stock business with the same factory. |
Next you will bring book-versus-physical checks, cycle counts, shrinkage causes and margin cost together into one complete working tool you can run on any order the business handles. Back to the course map