Google Shopping in the US is expensive and opaque — ROAS targets alone will not fix a campaign without the right feed and structure

Most US brands spending more than $5,000 per month on Shopping benefit from running both. Performance Max is the primary campaign and receives the majority of the budget because Google allocates more Shopping inventory to PMax than to Standard Shopping. Standard Shopping runs alongside it at a lower budget — its primary function is not to compete with PMax but to surface the actual search term data that PMax withholds. The search terms from Standard Shopping feed the negative keyword strategy for both campaigns and validate whether PMax titles and assets are matching the right queries. Running only PMax without any search term visibility mechanism is a structural disadvantage in a competitive market.

Performance Max does not provide individual search term reports. Google shows aggregated "search categories" in PMax reporting, which describe query themes rather than actual queries. The practical workaround is to run a Standard Shopping campaign with a lower priority and budget alongside PMax. Standard Shopping does surface individual search term data in the Search Terms report. By monitoring this report, you can identify irrelevant queries triggering Shopping clicks, build negative keyword lists, and understand which search intents are driving your Shopping traffic. There is no method within PMax itself to access individual search query data.

A supplemental feed is a secondary data source in Google Merchant Centre that overrides or adds attributes to your primary product feed without changing the source data. For a Shopify store, the primary feed pulls product data directly from the Shopify catalogue. A supplemental feed sits on top of it and replaces specific fields — most commonly product titles, descriptions, and custom labels — with optimised versions. You need a supplemental feed when your Shopping titles need to be different from your Shopify product titles (which they almost always do for query optimisation), and when you want to add segmentation attributes like margin tier labels without adding custom fields to every Shopify product manually. The supplemental feed makes the Shopping operation independent of whoever manages the Shopify product catalogue.

Margin-based segmentation is implemented using custom labels in the product feed. You assign a custom label value to each product based on its margin tier — for example, custom label 0 is set to "high," "mid," or "low" depending on the product's gross margin. In your PMax campaign, you create separate asset groups filtered by those custom label values. Each asset group receives a ROAS target calculated from the margin available in that tier. High-margin products can accept a lower ROAS target (more spend per revenue dollar) because each dollar of revenue generates more profit. Low-margin products need a higher ROAS target to remain profitable. Without this segmentation, a single ROAS target applies across all products regardless of their profitability, which produces a blended result that masks the performance of individual margin tiers.

ROAS targets in the US vary significantly by category, average order value, and margin structure. Highly competitive categories — consumer electronics, apparel, home goods, beauty — typically see Shopping ROAS between 3x and 6x for brands with well-optimised feeds and campaign structures. Categories with less competition or higher average order values can achieve 8x to 12x. The correct target for your business is not the category average. It is the ROAS at which your net margin after advertising cost remains positive: if your gross margin is 55% and you are willing to spend 15% of revenue on paid acquisition, your minimum viable ROAS is 6.7x. Setting a ROAS target below your margin-derived minimum produces profitable-looking campaigns that are losing money in aggregate. We calculate per-segment ROAS targets from your margin data as part of the campaign structure build.