Shopping is where retail ad budgets either win or leak. Good campaigns start in Merchant Center, with titles that lead with brand, model and size, and sale prices that match the site. Custom labels can group products by margin band and stock depth. Then Google Shopping campaigns can bid harder on the products that make you money.
If you’re running one Performance Max campaign across your whole catalogue, split your best-margin, best-stocked products into their own campaign first. That helps stop the algorithm spending on clearance lines that barely break even.

