You can use campaign priority to:

You can use campaign priority to:

• Have Google prefer certain inventory in query matching and ad serving
• Tell Google which campaign’s bid to use for a product when the same product is included in multiple campaigns
• Speed up how fast a campaign’s budget is spent throughout the day
• Make your Product Listing Ads more competitive in the auction

Answer is – Tell Google which campaign’s bid to use for a product when the same product is included in multiple campaigns