A Cairo online fashion boutique, 2020 to 2025. What closed it was not the marketing.
The business is not named. Unusually, we hold the complete books for this one — every order and every unit of stock — which is why this case can go further into the numbers than most case studies can.
Both things there are true at the same time, and most owners never hold them together. The advertising was excellent. The business was thin. A 13% net margin means one slow month, one unsold delivery, one currency move, and the quarter is gone.
The stockroom held 241 units across 127 separate lines.
This is the part worth reading twice, because it looks like merchandising and it is actually cash.
A one-unit line cannot be advertised profitably. You pay to photograph it, you pay to produce the creative, you pay the platform to find someone who wants it — and the moment that one person buys, everything you spent is written off against a single sale. The ad account never gets to learn, because the product is gone before the campaign matures. Then you do it again, for the next single piece.
A deep line behaves in the opposite way. The photography is amortised across every unit, the campaign has time to optimise, the cost of acquiring the second customer is lower than the first, and the profit compounds instead of restarting.
The boutique traded for five years and closed in December 2025. Demand was never the problem. The range structure was.
Return on ad spend measures the advertisement. Margin measures the business. A 5× return on a 13% net margin is a business with no shock absorber.
Count how many of your lines hold exactly one unit. If it is most of them, your marketing costs are being written off one sale at a time.
Variety feels like choice to the owner and reads as a thin shop to the customer. The money is in selling the same good thing repeatedly.
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