To keep a restaurant going you must have access to the essential items at all times. Running out of certain things can cause a delay in your ability to serve customers. For instance, if you begin serving a dish that becomes popular, the products for making the recipe might run out fast. You don't want to get into a position in which you are unable to serve the popular dish due to having to restock the ingredients, as you can end up missing out on making a substantial amount of money.