Your dashboard looks healthy. Campaigns are generating sales, ROAS is stable, ACOS is under control. Then someone asks a question almost nobody asks: how many of these sales would have happened anyway — through another one of our own campaigns?
This is known as cannibalisation, but that word hardly captures its importance. It isn’t simply an advertising issue. It’s a capital allocation issue — and for mature businesses it can quietly become one of the largest sources of wasted spend.
The mechanics behind this are in attribution versus incrementality; the allocation argument is in campaigns compete against each other.
The invisible competition
Most sellers imagine every campaign fighting competitors. That’s only part of the story. Inside your own account, campaigns constantly compete for:
- Clicks
- Budget
- Conversions
- Inventory
- Management attention
Amazon happily reports each campaign individually. It almost never tells you how they interact.
Imagine a football team where every player’s statistics are excellent, yet the team keeps losing. Individual performance isn’t the same as system performance.
Imagine a shopping mall
Picture a mall with two entrances. Both lead to exactly the same store.
Large sign
Even larger sign
Would adding a third entrance dramatically increase sales? Probably not. You’d simply change which entrance people use.
Many campaigns behave exactly this way. They’re not creating additional customers — they’re redirecting existing ones.
Three campaigns, one customer
Imagine a customer searches “stainless steel garlic press”.
- 1They first see your Sponsored Brand campaign
- 2Then your Sponsored Product campaign
- 3Then your Sponsored Display ad
Which campaign created the sale? The answer depends entirely on the attribution model. Each appears valuable. Yet the business generated only one customer.
Did three campaigns create value? Or did one campaign simply intercept another?
The illusion of more advertising
One of the biggest misconceptions in PPC is that more campaigns automatically produce more growth. Sometimes they do. Sometimes they simply produce more complexity.
Add another campaign targeting the same audience and traffic shifts, clicks redistribute, sales remain almost unchanged. The dashboard looks busier. The business hasn’t grown.
Experienced advertisers become suspicious whenever campaign counts increase faster than sales. Complexity often hides inefficiency.
Keywords can cannibalise each other
Many mature accounts contain thousands of overlapping keywords — broad, phrase, exact, automatic, product targeting, category targeting, brand campaigns. Each serves a purpose. Over time, overlap becomes inevitable.
Imagine two campaigns targeting nearly identical search terms. They begin competing in Amazon’s own auction. You’re not simply bidding against competitors anymore — you’re influencing which of your own campaigns wins.
Sometimes you increase your own advertising costs without increasing total sales. You’re paying more for the privilege of deciding which internal campaign receives credit.
Products can cannibalise each other too
Suppose you launch a premium version of your bestselling product and increase advertising. Sales look fantastic — until you notice the original product’s sales decline almost perfectly in step.
What it looks like
Growth New product performing well, advertising scaling.What may be happening
Redistribution Revenue similar, advertising higher, profit lower.Many companies celebrate launches without realising they’re redistributing demand rather than expanding it.
The most dangerous form of cannibalisation
Your branded campaign performs beautifully — high ROAS, excellent conversion — so you increase its budget. At the same time, your generic keyword campaign begins losing conversions. Not because competitors improved, but because shoppers who were previously discovering you through generic searches are now searching your brand directly.
Generic campaign
CreatedMade the customer aware of you in the first place. Now looks weaker on the dashboard.
Branded campaign
CapturedTook the final click from a customer who already knew your name. Now looks stronger.
Without understanding this relationship, businesses often reduce investment in the very campaigns responsible for long-term growth.
Internal competition creates bad decisions
Suppose every campaign manager is evaluated independently. Alpha wants more budget. Beta wants more budget. Gamma wants more budget. Each optimises their own performance. Nobody optimises the entire system.
- Every campaign grows
- Advertising spend increases
- The business becomes increasingly fragmented
Individual success does not guarantee collective success. This happens in organisations of every size.
Cannibalisation isn’t always bad
Cannibalisation has a terrible reputation. It shouldn’t. Sometimes it’s entirely intentional.
You replace your own product
Launching a premium version before a competitor does. You cannibalise part of your existing sales — far better than letting someone else do it.
Campaigns overlap unnoticed
Two campaigns chase the same search, the same customer, the same click. Nobody chose this. It just accumulated.
Apple has spent decades cannibalising its own products. The iPhone replaced the iPod. The iPad reduced Mac sales. Apple understood a simple principle: if someone is going to replace your product, it should be you.
Healthy cannibalisation strengthens the business. Unintentional cannibalisation wastes capital. The challenge is knowing the difference.
Attribution makes cannibalisation hard to see
Modern platforms are built around attribution. Every campaign wants credit, every click receives a source, every sale belongs somewhere. The problem is that attribution rarely asks what would have happened if this campaign didn’t exist.
If another of your campaigns would have produced the same sale, the business hasn’t gained much. The attribution report looks wonderful. The incremental value may be very small.
Imagine removing half your campaigns
Suppose tomorrow morning you paused half your campaigns.
- Which disappear forever?
- Which simply move to another campaign?
- Which shift to organic?
- Which shift to branded searches?
Many businesses assume every campaign is indispensable. Very few have actually tested that assumption.
The dashboard we actually need
Imagine opening your platform and seeing a completely different report:
- Campaign overlap
- Estimated internal cannibalisation
- Shared keyword competition
- Budget conflicts
- Incremental demand created
- Net business contribution
You’re no longer optimising campaigns. You’re optimising the entire system.
Think like a systems designer
The biggest shift experienced sellers make is realising advertising isn’t a collection of independent campaigns. It’s an ecosystem. Every campaign influences the others, every budget decision changes another opportunity, every keyword affects another search, every launch changes demand elsewhere.
The objective isn’t building great campaigns. It’s building a great system — and systems are judged by overall output, not by the performance of individual components.
Final thoughts
Most sellers spend their careers trying to outperform competitors. That’s important. But mature businesses eventually discover a different challenge: they must stop competing with themselves.
Campaigns stealing each other’s clicks. Products stealing each other’s demand. Budgets flowing toward campaigns that look impressive but add little incremental value. Management rewarding individual success while overlooking system performance. These aren’t advertising problems — they’re business problems.
“Which campaign performed best?”
“Which campaign created value that no other campaign could have created?”
Businesses become extraordinary by building systems where every campaign has a unique purpose, every dollar creates incremental value, and every investment makes the entire business stronger.