Three men walk into a bar. Each of them has just purchased the same item. Before going to the bar, the first man went to a store and bought a shirt. It now sits in his car. The second man went to that store’s website, found the shirt and purchased it. Two days ago. It was just delivered to his home. It now hangs in his closet. The third man went to the bar minutes after ordering from his smart phone the same shirt as the other two. It will be delivered to him at the bar.
Oh, how far we have come in such a short time. The delta of supply chain change is getting much bigger as it compresses time. And on-demand delivery is the most recent incarnation of that.