Answers
Why is one product taking all my Shopping budget?
Because it wins the most auctions, not necessarily because it earns the most.
The short answer
Because it wins the most auctions, not necessarily because it earns the most.
In a single campaign holding the whole catalogue, budget flows to whatever gets clicked — often the cheapest product, not the most profitable.
Fix it with custom labels and separate campaigns by margin tier so budget follows profit instead of clicks.
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