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cannibalization

Also called: cannibalisation, cannibalized sales

Sales of a new product or format that only replace sales of an existing one. Its value to the business is the new contribution minus the contribution of the sales it replaces.

Cannibalization is when a new product, plan or format takes sales from the company's own existing products instead of bringing new money. A cheaper tier that existing customers downgrade to, a bundle that replaces separate purchases, a group format that replaces one-to-one sessions: the new line's numbers grow while the old line's shrink.

To judge the new product, count what the company gains in total: incremental contribution = the new product's contribution − the contribution the moved customers used to leave in the old product. Comparing sales instead of contribution makes it worse, because a cheaper product that replaces a more profitable one can lose money while its sales look fine.

Measuring it needs data on where customers came from: a question at sign-up, a flag for customers who used to buy the old product, or a comparison with a group that wasn't offered the new one. Cannibalization isn't always bad: if a competitor would take those customers anyway, or the new product leaves more per customer, moving them is a gain. It just has to be counted.

Example

Klasna ran 48 English group sessions in March 2026. They sold 38,640 UAH and, after tutor payouts, video and fees, left 10,794 UAH of contribution.

But 30 of the learner-lessons came from families who dropped a one-to-one lesson for the group. Each of those used to leave 184.50 UAH: 30 × 184.50 = 5,535 UAH no longer earned. The pilot's real addition was 10,794 − 5,535 = 5,259 UAH, about 109.56 per session. More than half of what the new format showed had simply moved from the old one.

Common mistakes

  • Reporting the new line's sales as growth. Check what happened to the old line in the same period.
  • Comparing revenue instead of contribution. A cheaper format can bring sales and still lose money overall.
  • Not asking where customers came from. Without a sign-up question, a flag or a control group, cannibalization stays invisible.
  • Treating all cannibalization as bad. If the new product leaves more per customer or keeps them from a competitor, the move is a win; count it either way.

Learn it in the course

  • Case: should Klasna launch group lessons? · A group-lesson pilot sold well. Judge it by contribution margin: fill per session, cannibalization of the 1:1 lessons it replaced and the break-even of a new coordinator.