Everyone selling in Europe has heard the pitch: use a third-party CSS and get a "20% discount" on your Google Shopping bids. Mike Ryan and Chris finally settle what that number actually means — and it’s not a discount at all. They break down the real math behind Google Shopping Europe’s mandatory margin, whether a multi-CSS strategy still makes sense in 2026 (spoiler: it doesn’t), and why the fear of "bidding against yourself" across multiple CSS partners is a myth Google has gone out of its way to debunk.
Then: a lesson for every advertiser, EU or not. If bid is the only real differentiator between a PMax shopping ad and a Standard Shopping ad serving the identical product, what happens when you run both at once? Mike shares fresh CPC data across shopping-only, hybrid, and PMax-only accounts suggesting the answer is: your account gets hotter. Whether or not you technically "bid against yourself," running overlapping campaign types may be quietly inflating your CPCs — and Google’s new Channel Diagnostics report might be a tacit admission of exactly that.
In this episode:
• Myth #1: the "20% discount" claim — it’s purchasing power, not a discount
• The real math: how Google Shopping Europe’s mandatory margin actually hits your bid
• Do you still need a third-party CSS in 2026? (Yes — here’s why)
• Myth #2: does a multi-CSS strategy still make sense, or is it a "last-mover penalty"?
• Myth #3: are you bidding against yourself with multiple CSS partners?
• The bigger lesson: what happens when bid is the only ad rank differentiator?
• Fresh CPC data: shopping-only vs. hybrid vs. PMax-only accounts
• Google’s new Channel Diagnostics report for PMax — a tacit admission?
• The verdict: hybrid PMax + Shopping setups can work, but only with a real strategy
Growing Ecommerce is brought to you by smec (Smarter Ecommerce). Learn more: https://www.smarter-ecommerce.com
👉 Running PMax and Shopping side by side? Tell us what you’re seeing in your CPCs — drop a comment.
#GoogleAds #CSS #GoogleShopping #PerformanceMax #PPC #Ecommerce #GrowingEcommerce #SmarterEcommerce
About Smarter Ecommerce (smec):
Smarter Ecommerce (smec) empowers e-commerce brands with AI-driven PPC automation that optimizes for profit and business outcomes while maintaining strategic control.
The platform activates first-party data - profit margins, customer lifetime value, and key business metrics - to automate campaign optimization toward goals like profitability and efficient growth, while detailed campaign insights provide full transparency and enable PPC teams to focus on strategic oversight rather than manual execution.
As a Google Premier Partner and three-time Microsoft Retail Partner of the Year, smec manages over €500 million in ad spend and drives €5B+ in annual e-commerce revenue for 350+ global retail clients including THG, Snipes, REWE, and Intersport.
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