Product group
The slice of your feed a Shopping ad group bids on — and the level spend is reported at.
A product group is how a Shopping campaign divides the feed: all products, or by brand, category, custom label or item ID, each with its own bid. Because Shopping reporting rolls views and clicks up to the group rather than to a keyword, it is the level at which spend with no sales becomes visible. A group that has spent several times the account's normal cost per sale with none is the Shopping leak; pausing the ad group that holds it stops the spend while the products, their titles or their bids are reworked. Splitting a single "all products" group into a few meaningful ones is often the first improvement a Shopping account can make.
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