[darkarmani]

> They don't make the computers, fiber optics, switches, exchanges, or software that their web site requires to run. They don't own the fleet of trucks, boats, and planes required to get their product to their customers - or their raw materials from plant to plant.

You aren't describing a supply-chain. They don't lose a computer for each item sold. The difference is that they can have a disruption in their infrastructure suppliers but continue to sell products at a degraded pace. If they lose all access to a raw material (supply chain), they can't sell any more product once they are out of supplies.