If you’re preparing for the Google Ads Measurement Certification , you may already know what attribution models are. But do you understand how they influence Smart Bidding decisions ? Google’s bidding algorithms rely on conversion data — and that data is shaped by the attribution model you choose. This article will help you connect those two concepts: how attribution changes bidding behavior , and how that appears in certification exam questions. Smart Bidding algorithms (Target CPA, Target ROAS, Maximize Conversions) rely on conversion data to: But here’s the key: Each model decides which touchpoints in the user journey get credit for a conversion. If you use Last Click , Smart Bidding only sees conversions attached to the final click — even if earlier interactions were more influential. Let’s say you run a multi-touch campaign: If you use Last Click , Smart Bidding gives all conversion credit to Search . If you use DDA , it may give partial credit to Display. Result:

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