The term 'supermarket supply' refers to the items that are necessary for a supermarket to function. This includes CARTS and BAGS, which are both essential for customers to transport their groceries. CARTS are five-letter items that are typically wheeled and used to carry multiple items at once. BAGS are four-letter items that are usually made of paper or plastic and are used to carry individual items. Both CARTS and BAGS are necessary for customers to transport their groceries from the store to their homes.