Barcode

The cashier scanned the barcode.

The barcode has to be facing up.

Experts say no company has put barcode technology to better use than Wal-Mart, based in Bentonville, Arkansas. By nineteen eighty-eight, all Wal-Mart stores used laser bar code scanners. Highly detailed records on its products, and how they were selling, helped Wal-Mart keep costs down. Today, Wal-Mart is the world’s biggest corporation.

There is a barcode on the back of all books from Tom's publishing house.