How to choose products for promotion without burning margin?
A good promotion does not start with the discount level. It starts with choosing products that make business sense: they have margin, stock, conversion potential and fit the campaign goal.
Why a bestseller is not always the best product to promote
Many stores choose promotional products by intuition: promote the bestseller, the product with too much stock or the product the supplier wants to push. It is fast, but risky. A bestseller may have weak margin, a product with high stock may have no demand, and a deep discount can train customers to wait for lower prices.
Products for promotion should be evaluated like an investment. Every homepage slot, newsletter block, ad or category position has an opportunity cost. If you show one product, you do not show another. Choose products that combine sales potential with a reasonable financial result.
Data to check before a promotion
| Data | What it tells you | How it affects the decision |
|---|---|---|
| Gross margin | What remains after product cost. | Defines whether a discount is safe. |
| Gross profit | What the product contributes financially. | Prevents promoting only revenue. |
| Conversion | Whether the product turns traffic into orders. | High conversion shortens the path to campaign results. |
| Views | Whether the product already gets attention. | Many views and weak sales point to an offer problem. |
| Stock level | Whether the store can handle demand. | Low stock limits the value of a large campaign. |
| Seasonality | Whether demand depends on timing. | Helps choose timing and discount depth. |
| Returns | Whether sales come back to inventory. | High returns can erase promotion profit. |
| Campaign cost | How much traffic acquisition costs. | The promotion must carry both discount and media cost. |
A product selection matrix
A simple model splits products by margin, conversion and stock. It does not replace strategy, but it quickly shows where promotion makes sense and where it is only an expensive attempt to save a weak product.
| Product type | Signal in data | Decision |
|---|---|---|
| Premium candidate | High margin, good conversion, stable stock. | Promote strongly, not necessarily with a deep discount. |
| Visibility candidate | High margin, low views, reasonable stock. | Show higher in category, newsletter or recommendations. |
| Product to improve | Many views, low conversion. | Improve page, price, images or variants first. |
| Clearance product | High stock, weak turnover, limited season. | Promote with controlled discount and a stock reduction goal. |
| Risky product | Low margin, high ad cost, high returns. | Do not promote broadly without calculating break-even. |
How to check whether a discount makes sense
A discount reduces revenue, but product cost usually stays the same. A 20% discount can take much more than 20% of profit. Before launching, calculate how many extra units are needed to protect the result.
- Margin before discount: price minus cost of goods.
- Margin after discount: discounted price minus cost of goods.
- Margin lost per unit: margin before discount minus margin after discount.
- Required sales lift: additional units needed to compensate for lower margin.
- Campaign cost: discount is not the only cost of promotion.
If margin is low, a promotion may still work for customer acquisition, stock clearance or basket growth, but it should not be judged by revenue alone.
Promotion does not have to mean a discount
In e-commerce, promotion is often treated as a price cut. Many products are better promoted through visibility, bundles, gifts, free shipping thresholds or better matching to customer intent.
| Mechanism | When it works | Risk |
|---|---|---|
| Better visibility | The product has margin and conversion but low traffic. | It takes space from other products. |
| Percentage discount | The product has stock and enough margin. | It can reduce profit and train customers to wait. |
| Bundle | Products complement each other and increase basket value. | A weak bundle makes the decision harder. |
| Free shipping threshold | The basket is close to a profitable threshold. | It can erase margin for heavy products. |
| Gift with purchase | You have a low-cost item with high perceived value. | Gift stock must be controlled. |
How to measure promotion performance
A promotion should have one primary goal. Otherwise it is easy to call a campaign successful because revenue increased while margin, product mix or stock availability got worse.
- revenue and gross profit from promoted products,
- margin after discount and campaign cost,
- units sold compared with available stock,
- product conversion before and during the promotion,
- impact on basket value and complementary products,
- returns after the campaign,
- whether the promotion acquired new customers or only discounted existing demand.
Promotion break-even point
Before launching a discount, calculate the break-even point. Compare margin before the promotion with margin after discount and campaign cost. If a product costs the store 60 and the regular price is 100, margin before discount is 40. With a 20% discount, price drops to 80 and margin drops to 20. You need to sell twice as many units to keep the same gross profit, before media cost is included.
This simple example shows why revenue-based promotion reporting can be misleading. A campaign may increase orders, but if volume does not grow enough, the store earns less than without the promotion.
| Element | Before promotion | After 20% discount |
|---|---|---|
| Selling price | 100 | 80 |
| Cost of goods | 60 | 60 |
| Gross margin per unit | 40 | 20 |
| Units needed for 400 margin | 10 | 20 |
Promotion by campaign goal
The same product can be a good or bad choice depending on the goal. A customer acquisition campaign needs different products than a stock clearance or basket value campaign.
| Goal | Best product type | What to avoid |
|---|---|---|
| New customer acquisition | Easy-to-understand product with good post-purchase experience. | High-return products or complicated variant selection. |
| Margin growth | Product with high profit per view and stable conversion. | Bestsellers with weak profit after discount. |
| Stock reduction | Slow-moving product that is still attractive to a specific segment. | Deep discounts on products with no traffic and no demand. |
| AOV growth | Complementary products, bundles, accessories and shipping thresholds. | Mechanics that reduce margin across the whole basket. |
| New category test | Representative products that are easy to compare. | Niche SKUs that do not reveal category potential. |
The post-promotion plan is part of the promotion
Many promotions end when the banner or campaign is turned off. That is too late. Decide before launch what happens after the promotion ends.
- If the product sold well without margin loss, it can move higher in the permanent category ranking.
- If it sold only with a deep discount, do not treat the result as proof of stable demand.
- If returns increased, review copy, images, variants and campaign messaging.
- If stock ran out too quickly, improve demand forecasting before the next campaign.
- If complementary products increased, keep that bundle as a standing recommendation.
How to start from a CSV file
A first selection can be built from SKU, product name, category, price, cost, units sold, revenue, views, stock level and returns. From this, calculate margin, conversion, profit per view and inventory risk.
The best promotion list is not the list of products with the highest stock. It is a ranking of products with the strongest balance of sales potential, margin, availability and campaign goal.
Choose promotional products with data
Upload a CSV file to Insighteo App and see which products have visibility, sales and profit potential before deciding on a discount.
Create an account and upload CSV