What is an advantage of selling consumable items

Selling consumable items leads to continual purchase of the commodity. For instance, consumable products like milk and cereal will be purchased frequently. Something like a computer, however, will not be purchased as often. Consumable items have the advantage of constant income, whereas a product like an iPhone may spike in purchases when first released and then decrease as time goes on.

Consumers are constantly buying and eating over and over again.