One jeweler I work with, to avoid litigation, recently had to settle with a customer over a missing ring. The customer claimed she never picked up her ring, while the store showed the job as delivered, but only in the computer!
Cars take up space. Inventory takes up dollars. A well oiled merchandise highway allows plenty of space (dollars) for new product to enter from the right, and move from lane to lane without obstruction. As these products accelerate, other merchandise gets out of the way to allow their passage. They beep and wave as they go by, and exit off to the left at often blazing speeds.