Two of your campaigns are competing for the same people

Your lookalike audience and your interests audience share 63% of the same users. You're paying twice to reach them.

Audience composition · LAL 1% vs Sparkling-Water Interests

Overlap (auction conflict) · 63%
Unique to LAL 1% · 22%
Unique to Interests · 15%

Costing you

$1,140

per month · $13,680 per year

Time to fix

8 min

Estimated, in Meta Ads Manager

How sure are we

High confidence · 90%

Below 90% comes with a 'what would change our mind' note

What's happening

Two of your ad sets — the 1% lookalike of purchasers, and the broad sparkling-water interests set — are aimed at mostly the same people. 63% of the audience sits in both.

What that means: every time one of those overlapping users could see an ad, Meta runs a mini-auction between your two ad sets. You're paying a premium to win an auction against yourself. The fix takes 30 seconds — add an exclusion in the secondary ad set so each user is only targeted by one.

How to fix it

Step-by-step, in Meta Ads Manager. No external tools needed.

Decide which of the two ad sets is the primary — pick the one with the better 60-day cost per purchase.
In the secondary ad set, add the primary's custom audience to the Exclude list under targeting.
Save. Meta does not reset the learning phase for exclusion changes.
Re-audit in 7 days — CPM on the primary should drop 5–15%.

The exact numbers we fired on

Click to see the raw evidence. Useful if you want to verify our math before acting.

Audience A: LAL 1% Purchasers US
Audience B: Sparkling-Water Drinkers Stack
Overlap: 63%
Combined spend (60d): $22,800
Monthly waste (10%): $1,140/mo

Want the full methodology behind this rule? Read the methodology →

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