The phrase "store shelves" refers to the horizontal surfaces in a retail store where products are displayed and sold. These shelves can be found throughout the store, including in departments such as grocery, household items, electronics, clothing, and more. The term also encompasses any additional fixtures or displays that may be used to showcase merchandise, like end caps, pallet displays, or seasonal decorations. In essence, "store shelves" refers to the entire system of product display within a retail establishment.