This non-Google case study on Shopping Actions examines what happens when exposing GSA ads for low funnel searches and PLA ads for high funnel searches (hint: it works out quite well).

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Search Engine Land: News & Info About SEO, PPC, SEM, Search Engines & Search Marketing https://searchengineland.com/google-shopping-actions-vs-google-shopping-a-real-world-case-study-313688