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Calculating your margin: the costs everyone forgets

L'équipe PSM· Rédaction· 17 September 2026· 1 min
Calculating your margin: the costs everyone forgets

Purchase price and selling price are not enough. What slips between them and eats the profit.

The real cost of a unit

On top of the purchase price come transport, handling fees, packaging and the time spent receiving goods. Spread across the batch, these often represent 5 to 15% of the purchase price.

An item bought at 100 therefore costs 110 before it even reaches the shelf. Reasoning on 100 distorts every decision that follows.

Unsold stock is part of the calculation

If 10% of a batch does not sell, the remaining 90% must carry that loss. A stated 30% margin becomes a real margin of around 20%.

That is why a slow-moving reference can be less profitable than a low-margin one that sells fast.

The Ordinary - Glycolic Acid 7% Exfoliating Toner 240 ml
Our pick : The Ordinary - Glycolic Acid 7% Exfoliating Toner 240 ml — 137 MAD

Rotation, the key indicator

A product at 20% margin sold four times a month earns more than one at 50% sold once. That is the calculation most beginners never make.

Tracking units sold per month per reference is more useful than tracking the stated margin. It is also what tells you what to restock first.

Mixa FRESH AND MELTING CREAM WITH PURE HYALURONIC ACID - FACE, BODY, HANDS
Our pick : Mixa FRESH AND MELTING CREAM WITH PURE HYALURONIC ACID - FACE, BODY, HANDS — 64 MAD
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