What it means
Cannibalisation is the internal cost of a launch. When a business introduces a new line, some buyers who would have bought the old line switch across, so part of the new revenue is simply recycled rather than genuinely new.
The reason this matters is that management often judges launches on gross sales of the new item. If half those sales came from an existing product, the company has spent launch money to move customers sideways rather than to grow.
Measuring it means asking what would have happened without the launch. Analysts typically compare the fall in the old product's sales against its previous trend, or run a controlled test where the new product is launched in some regions and held back in others.
Deliberate cannibalisation is often the right call. If you do not launch the cheaper or newer version, a competitor eventually will, and it is generally better to take the sales from yourself than to hand them to somebody else.
The nuance lies in margin rather than volume. Cannibalising a low-margin product with a high-margin one can increase profit even as unit sales stay flat, while the reverse quietly destroys value even when headline revenue looks healthy.
In practice
Real-world examples.
Example
A bakery chain adds a cheaper breakfast roll and watches sales of its premium pastry fall by a third. Footfall is unchanged, so most of the new roll's volume came from existing customers trading down.
Example
A software company launches a self-service tier at a lower monthly price. Some smaller customers downgrade from the mid tier, but the tier also brings in buyers who would never have paid the higher price, so management tracks the two groups separately.
Example
A supermarket opens a second store four miles from an existing one. The original store's takings drop 15%, but combined sales across both sites rise, and the chain accepts the overlap to block a rival from taking the site.
Formula
Calculation
Cannibalisation rate = units lost from the existing product / units sold of the new product x 100
Incremental profit = (new product units x new margin) - (cannibalised units x old margin)
A kitchen appliance maker launches a compact blender and sells 20,000 units in the first year. Sales of its established full-size blender fall by 6,000 units against trend over the same period.
Cannibalisation rate = 6,000 / 20,000 x 100 = 30%
The new compact blender earns a contribution margin of $25 a unit, and the full-size model earned $18 a unit.
Gross profit from the new product = 20,000 x $25 = $500,000
Profit lost on the old product = 6,000 x $18 = $108,000
Incremental profit = $500,000 - $108,000 = $392,000
So the launch looks like a $500,000 win on the surface, but the genuine gain is $392,000, which is 78% of the headline figure. That is still a good outcome, and it stays positive because the new product carries the higher margin of the two.Case study
Seen in the real world.
Larkfield Outdoor is a fictional camping equipment brand used here as an illustrative example. Larkfield sold a flagship four-season tent at $600 with a contribution margin of $210, and launched a lighter three-season version at $380 with a margin of $150, expecting to reach a younger customer group.
First-year sales of the new tent reached 9,000 units, which the sales director presented as a clear success. The finance team then showed that flagship sales had fallen by 4,000 units against a stable three-year trend, giving a cannibalisation rate of 4,000 / 9,000, or 44%. New product profit of 9,000 x $150 = $1,350,000 was offset by 4,000 x $210 = $840,000 of lost flagship profit, leaving incremental profit of $510,000.
The illustrative conclusion was mixed rather than negative. The launch still added profit, but far less than the headline suggested, and Larkfield changed its marketing to push the lighter tent at customers who had never bought from the brand instead of advertising it to its own existing base.
Watch out
Common mistakes.
- Comparing the old product's sales only against last year rather than against its expected trend. A product already in decline would have lost sales anyway, so a simple year-on-year comparison overstates cannibalisation.
- Judging cannibalisation on units alone. What matters is the profit given up, and a low-margin product being replaced by a high-margin one can be a clear win despite flat volume.
- Assuming all cannibalisation should be avoided. Refusing to launch a product a competitor is about to release simply hands them the switching customers.
Questions
People also ask.
How can a business estimate cannibalisation before launching?
Run a regional test or a customer survey that asks buyers what they would have purchased instead, then apply the answer to forecast volumes.
Is cannibalisation the same as a product line extension failing?
No, the extension can sell extremely well and still cannibalise heavily, which is why the two measures must be reported side by side.
Does cannibalisation apply to services and channels too?
Yes, an online channel taking sales from physical branches is one of the most common forms of it.
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