Microsoft Ads
Microsoft is the clearest example of the argument this whole practice is built on. It is a genuinely different auction, with different competitors, different audience data behind it and, in several sectors, materially cheaper clicks.
Beyond
The argument
Your account has notstopped working. It hasrun out of cheap inventory.
Large Google accounts plateau for a structural reason, and spending more inside the same auction is the one response guaranteed not to fix it.
Why more budget on one channel stops working
Marginal return per extra pound, as spend rises on a single channel, against the opening rate of a channel you are not in yet.
Illustrative model, not account data. The shape is what auction competition does to marginal return; where your own curve crosses is exactly what the audit works out.
One crowded auctionThree that are notTest before you commit
The whole argument, in one line
Google is the auction everyone has already bid up. The other three are the ones most of your competitors are not in yet.
The mechanism
Four reasons thiskeeps happening
- 01
Google is the most crowded auction you can buy
Every competitor your client has is already bidding there, and most have been for a decade. That is what an efficient market looks like, and it is why the next pound of Google budget buys worse traffic than the last one did. Nothing is wrong with the account. It has simply run out of cheap inventory.
- 02
The other auctions have not been picked over
Microsoft has fewer advertisers competing for the same commercial intent. TikTok search is young enough that most categories are barely contested. Programmatic private marketplaces are negotiated rather than auctioned to the whole market. Less competition is not a marketing claim, it is the mechanism.
- 03
Agencies are staffed for Google, not for four platforms
A generalist team can plausibly keep one platform current. Four platforms, each with its own campaign types, its own automation and its own release cycle, needs four specialists. Most agencies cannot justify that against a single retainer, so the work quietly does not happen and the budget stays where it is.
- 04
Concentration is a commercial risk as well as a cost
When one platform owns the whole pipeline, a policy change, a suspension or an algorithm update is not a bad month. It is an existential event. Spread is not just cheaper traffic, it is the thing that stops one account review from taking the quarter with it.
Three auctions
What is actually out there
Each with its own page covering every funnel stage and every campaign type.
Programmatic
Programmatic is the only channel on this list where the main risk is not execution but the supply chain. Every hop between your budget and the publisher takes a margin, and most of the reporting in the category is built to make that hard to see.
TikTok Ads
TikTok stopped being a reach channel some time ago. It now has search, a shopping stack and automated performance campaign types that close sales inside the app.
Testing
How to find out withoutbetting the budget
You do not have to take any of this on faith, and you should not. The honest version is a test with a defined size, a defined period and a measurement setup good enough to read the result.
That last part is where most channel tests fail. If the tracking under-reports a channel, the test will conclude the channel does not work, and the account will go back to spending everything on Google for the next three years on the strength of a broken pixel.
Which is why we build the measurement for freebefore anyone commits to a retainer, and why the audit tells you which channels are worth testing at your scale rather than assuming all of them are.