Quick Answer
Performance Max and Standard Shopping serve different jobs. PMax provides amplification and surface coverage. Shopping provides query-level controllability. Most Shopify stores above $500K annual revenue benefit from running both in the Three-Layer Architecture. Below $500K, Shopping alone is usually the correct structure.
What each campaign type does
Shopping: serves product-listing ads in Google Search and the Shopping tab. Query-level visibility, negative keyword control, manual or automated bidding. PMax: serves ads across Search, Shopping, Display, YouTube, Discover, Gmail. Black-box amplification with audience signal and asset group guidance.
When to run Shopping alone
Below 30 conversions per 30 days, PMax cannot train. Shopping with manual CPC or Maximize Clicks gives you controllability and measurable results. This applies to roughly half of Shopify stores under $500K annual revenue.
When to run both
Above the conversion volume threshold, run both in the Three-Layer Architecture. Separate Search for intent capture; Shopping for product discovery; PMax for amplification. Each layer gets its own job; brand negatives keep PMax from cannibalizing Search.
Common Questions
On record.
Can I run PMax without Shopping?
Yes technically, but you lose query-level controllability. Most Shopify stores above threshold benefit from having both.
Will Shopping cannibalize PMax or vice versa?
They will compete on some queries. The Three-Layer Architecture uses bid hierarchy and negatives to determine which wins which auction.
What is the minimum catalog size for PMax to work?
Not a SKU count; a conversion volume threshold. Roughly 30 conversions per 30 days regardless of catalog size.
Can I test PMax without committing budget?
Run PMax at 20 percent of Shopping budget for four weeks. If PMax outperforms on ROAS, increase its allocation. Most large catalogs eventually settle at 60-70 percent PMax, 30-40 percent Shopping.
Does this apply to Meta or only Google?
This framework is Google-specific. Meta has different surface types and the decision framework is different.
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