Option (a), Grocery stores have raised the size of the carts to encourage customer purchases.
Supermarkets promote impulse purchases by putting items on display at the checkout counter, where consumers must wait in line, for items ranging from candy bars and full-calorie soda to hand sanitizer and gift cards. Manufacturers spend a lot of money to bribe retailers to place their products at the checkout because it increases sales so much.
Profit margins typically range from 1% to 3%, depending on the product. A supermarket business frequently makes only a few cents per item. Volume is how grocery stores make money. Customers are expected to purchase a large number of things during each shopping trip in order to increase the store's earnings.
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