Why your ACoS stays "healthy" while your growth stays flat, no matter how hard y
By Elizabeth Greene · July 7, 2026 · Curated by George's Blog
Why your ACoS stays "healthy" while your growth stays flat, no matter how hard you try.
I saw this play out with a brand that had been sitting at 12% total ACoS for three years.
On paper, that looks controlled.
The kind of number people nod at in reporting calls.
But revenue had barely moved.
Three years of clean reports.
Three years of no real growth.
Their agency kept saying the same thing:
“We need more spend.”
So we opened the account and followed the money.
Almost all of it was sitting on branded keywords.
The account looked efficient because it was mostly paying to defend demand that already existed.
People were already searching for the brand.
People were already close to buying.
The ads were getting credit, but they weren’t creating much new demand.
And once you see that, the 12% ACoS starts to look very different.
It wasn’t proof the strategy was working.
It was proof the strategy was safe.
Too safe.
So we changed the role of the account.
Branded protection stayed, but it stopped swallowing the whole budget.
We started putting money into places that could actually open up growth.
More category terms.
More non-branded traffic.
More competitor positioning.
More campaigns built to find new customers instead of just catching existing ones.
Three months later, the account was still around 12% total ACoS.
Same headline number.
Completely different business underneath it.
The brand was up 30% year over year.
That’s what gets missed when everyone stares at ACoS like it tells the whole story.
Sometimes the number is fine.
The mix behind it is the thing quietly holding you back.