𝐏𝐫𝐨𝐦𝐨𝐭𝐢𝐨𝐧 𝐂𝐚𝐧𝐧𝐢𝐛𝐚𝐥𝐢𝐳𝐚𝐭𝐢𝐨𝐧: 𝐖𝐡𝐞𝐧 𝐃𝐢𝐬𝐜𝐨𝐮𝐧𝐭𝐬 𝐒𝐡𝐢𝐟𝐭 𝐑𝐚𝐭𝐡𝐞𝐫 𝐓𝐡𝐚𝐧 𝐆𝐫𝐨𝐰 𝐒𝐚𝐥𝐞𝐬

 

Is your retail promotion actually driving incremental sales, or simply shifting sales from one product to another?

Retail promotions and discounts are designed to increase sales, attract customers, and drive revenue. But a promotion can sometimes produce a very different outcome: promotion cannibalization.

Promotion cannibalization happens when a discounted product gains sales at the expense of another product within the same category. As a result, the promoted SKU may show strong growth while overall category sales remain flat or even decline.

What Is Promotion Cannibalization in Retail?

In simple terms, promotion cannibalization occurs when customers switch from one product to another because of a promotion, rather than making an additional purchase.

This is particularly relevant in apparel retail, where products such as shirts, trousers, T-shirts, and similar styles often compete for the same customer demand.

For example, a discount on one apparel product may increase its sales significantly. However, if some of those purchases come from customers who would otherwise have bought another product, the promotion may be shifting existing demand rather than generating incremental sales.

Why Retailers Need to Look Beyond SKU-Level Sales

Looking only at the performance of the promoted product can make a promotion appear more successful than it actually is.

Retailers should compare:

• Promoted SKU sales

• Non-promoted product sales

• Total category sales

• Incremental revenue

• Customer switching behaviour

A product-level sales increase does not necessarily mean that the overall category has grown.

A Simple Apparel Retail Example

Imagine an apparel retailer selling two similar products.

Before the promotion, Product A and Product B together generate ₹10 lakh in sales.

After a discount is introduced on Product A, its sales increase to ₹7 lakh. However, Product B's sales fall to ₹2 lakh.

The combined category sales are now only ₹9 lakh.

Product A appears to be performing extremely well, but the overall category has actually declined.

This is the hidden impact of promotion cannibalization.

How Can Retailers Measure Promotion Cannibalization?

To understand the true impact of a promotion, retailers need to evaluate performance at both the product and category level.

Instead of asking only:

“Did the promoted product sell more?”

retailers should also ask:

“Did the promotion generate additional category sales?”

This broader approach can help retailers distinguish between incremental growth and sales shifting.

The Bigger Picture

Effective retail promotion analysis requires more than tracking the sales uplift of a discounted SKU. Retailers need to understand how promotions influence the entire product category.

By analysing SKU-level performance alongside category-level sales, retailers can identify potential cannibalization, evaluate promotional effectiveness, and make more informed merchandising and pricing decisions.

The goal isn't simply to sell more of the promoted product. It's to understand whether the promotion is creating genuine incremental value.

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