Updated on 12 November 2026 by Nicolas Finet, CEO of Sortlist. We have rewritten this guide to clear up a common confusion: "cannibalisation" means two different things in marketing. This article explains product (market) cannibalisation, when it is a problem and when it is a deliberate strategy, and also covers keyword cannibalisation in SEO, with fixes for each.
Cannibalisation in marketing happens when a company's own product, offer or page takes sales or traffic from another one of its own. Product cannibalisation (also called market cannibalisation) is a new or existing product reducing sales of another product from the same company. Keyword cannibalisation is an SEO problem in which several pages on one site compete for the same search term, so none ranks as well as it could.
Key takeaways
- Product cannibalisation can be intentional (replacing an old product) or unintentional (a new variant steals sales); it is only a problem if total profit falls.
- Measure net effect: new product sales minus lost sales of existing products, plus changes in margin and market share.
- Deliberate cannibalisation can protect you from competitors, serve a new segment or move customers to higher-margin products.
- Keyword cannibalisation is an SEO issue fixed by assigning one target term per page, merging overlapping pages, redirecting and using canonical tags.
- Check both: a product range with near-identical product pages can suffer both kinds at once.
Product (market) cannibalisation
| Situation | Example pattern | Good or bad? |
|---|---|---|
| Replacing your own product | Launching a new model that makes the old one obsolete | Often good: you decide when to replace before a competitor does |
| Targeting the same customers with a cheaper line | A budget version that attracts premium buyers | Bad if margin falls more than volume rises |
| Targeting a new segment | A smaller pack or lower-priced range for new customers | Good if most sales are incremental |
| Recovering lost sales | Launching a new offer to win back customers lost to competitors | Good if it takes share from rivals rather than your own products |
| Frequent discounting | Promotions pulling forward full-price sales | Often bad: it trains customers to wait |
How to measure cannibalisation
- Define the baseline. Sales and margin of existing products before launch.
- Track after launch. Sales of the new product and of existing products.
- Estimate the cannibalisation rate. Lost sales of existing products divided by sales of the new product. If the new product sells 1,000 units and existing products lose 300, the rate is 30%.
- Compare profit, not just revenue. Include margin differences, launch costs and any market share gained from competitors.
- Use customer data. Survey or analyse purchase histories to see which products buyers switched from.
When cannibalisation is worth it
- You can capture customers who would otherwise leave for a competitor.
- The new product has a higher margin or lower cost to serve.
- Technology or customer expectations are changing and waiting would be riskier.
- The new offer reaches an additional segment, so most of its sales are incremental.
Sortlist editorial note: cannibalisation is a symptom only if the total does not grow. Ask "what would customers have bought otherwise?" rather than "did one product lose sales?"
Sortlist editorial team
How to reduce harmful cannibalisation
- Differentiate products clearly by audience, use case, price point and features.
- Avoid overlapping launches and promotions in the same period for similar products.
- Position the new product with distinct messaging and channels.
- Test with a limited rollout and measure before scaling.
- Review your product range regularly and retire weak or duplicate items.
Keyword cannibalisation in SEO
When several pages on your site target the same or very similar queries, search engines receive mixed signals about which page to show. Rankings can fluctuate and the strongest page may not be the one that appears. Typical examples are a category page and a blog post aimed at the same commercial keyword, and ecommerce sites with many near-identical product pages.
| Fix | When to use |
|---|---|
| Assign a unique target keyword to each page | During content planning; use keyword clusters |
| Merge overlapping pages into one stronger page | Pages with thin or duplicate content |
| Redirect outdated pages to the best match | Old posts that duplicate newer content |
| Use canonical tags for product variants | Parent product page with variants accessed by selectors |
| Target long-tail terms on individual product pages and link to a broader category page | Large catalogues |
| Review Search Console queries | To spot several URLs appearing for the same query |
See our guide to SEO basics.
Frequently asked questions
What does cannibalisation mean in marketing?
A company's own product or offer reducing the sales of another of its products. In SEO it also refers to pages competing against each other.
Is cannibalisation always bad?
No. If it protects market share or increases total profit, it can be strategic.
How do I know if I have keyword cannibalisation?
Search Console shows several of your URLs getting impressions for the same query, often with unstable rankings.
Need help with product strategy or SEO? Post your project on Sortlist and compare UK marketing agencies for free.
Sources: Shopify, keyword cannibalisation, Impression Digital, keyword cannibalisation complete guide, Clearscope, what is keyword cannibalisation, QueryClick, how to avoid keyword cannibalisation. The numerical example is illustrative.
