I always wonder what products are so important that they need to be delivered next day? The few times I realised I need something urgently it typically means today and even next day delivery is not enough, so I go to a store and possibly pay a slightly higher price. For everything else it doesn't really matter if it is one or 5 days. Is the next day delivery really necessary or does it just appeal to our impulse of needing to have it in our hands right now?