Most Google Shopping optimisation focuses on bidding. Adjust targets, test strategies, layer audiences. This is where agencies spend their time because it feels like work.
But in Shopping, the feed is the foundation. Get it wrong, and no amount of bid sophistication will save you.
The Hierarchy of Influence
Google Shopping performance is determined by a hierarchy:
- Feed quality and structure
- Product data accuracy
- Campaign architecture
- Bidding strategy
Most optimisation effort goes into the bottom of this list. The highest leverage sits at the top.
Why Feed Wins
Your feed determines which queries your products match, how they appear in results, and whether they are eligible to show at all. It is the raw material Google uses to decide if your product is relevant.
A well-structured feed with accurate titles, GTINs, and product attributes will outperform a poorly structured feed with perfect bidding. The algorithm needs good data to work with.
Common Feed Problems
The issues I see most often in feed audits:
- Titles that bury the product type behind brand names
- Missing or incorrect GTINs that limit match eligibility
- Generic product types that force Google to guess
- Inconsistent variant handling that fragments performance data
- No custom labels for margin-based segmentation
Each of these problems compounds. Together, they create an account where even aggressive bidding cannot overcome structural disadvantage.
The Optimisation Trap
Agencies often default to bid changes because they are fast and visible. Clients can see the activity. Feed work is slower, less visible, and requires technical coordination.
But the returns are asymmetric. A 10% improvement in feed relevance typically delivers more than a 10% change in bid strategy. The algorithm rewards better data.
Where to Start
If your Shopping performance has plateaued, the answer is rarely in your bidding. It is almost always in your feed structure.
Start with titles, product types, and custom labels. Get the foundation right before you optimise what sits on top of it.