Imagine you hire a sales team. You have a guy who hands out flyers (The Opener) and a guy who signs the contracts (The Closer).
At the end of the month, you look at the sales report. The Closer signed 100% of the deals. The Opener signed 0%. So, you fire the Opener.
Next month, sales drop to zero. Why? Because nobody is handing out flyers. This is exactly what happens when you use "Last Click" attribution in Google Ads.
The Soccer Analogy
Last Click Model: Player 3 gets 100% of the credit. Players 1 and 2 are worthless.
Data-Driven Model: The system analyzes the replay and realizes the goal wouldn't have happened without Player 2's cross.
(First Search)
(Research)
(Branded Search)
Why "Last Click" Drains Your Funnel
If you use Last Click, you will see that generic keywords like "AC Repair" have a high CPA, while your brand name "Smith HVAC" has a low CPA.
So, you pause "AC Repair." Suddenly, nobody is searching for "Smith HVAC" anymore because you cut off the supply of new people finding your brand.
The Solution: Data-Driven Attribution (DDA)
Google's default used to be Last Click. Now, it is Data-Driven.
DDA looks at all your user paths—both converting and non-converting. It calculates the statistical probability of each keyword contributing to a sale.
- It values the "Opener": It might give 40% credit to "Roof Leaking" even if the user clicked "Bob's Roofing" later to convert.
- It stabilizes your bidding: Because credit is shared, your "expensive" top-of-funnel keywords get credit for the conversions they assist, lowering their effective CPA.
Conclusion
If you are still judging your ads based on Last Click, you are making decisions based on partial data.
Switch to Data-Driven Attribution today. It stops you from firing your "Opener" and ensures your sales pipeline stays full.