Only once have I used a grocery-delivery service. I picked out my items, and the following evening a young delivery man came with my order.

The receipt that the delivery man left with me had been printed by the same process used for the receipts of in-store cash registers. The layout and formatting were identical.

However, in the space where a cash register's receipt would have read, "Today, your cashier was So-and-so," this receipt instead said:

"Today, your cashier was Virtual."