Digital Tags Help Ensure the Price Is Right
Some decades ago, a grocery store's aisles were often filled with "chunk-a-chunk-a" sounds, as clerks stamped prices to the tops of cans and boxes before putting them on shelves. It was a labor-intensive operation, but it did result in a price being affixed to most every item in the store.
Then bar codes and computerized cash registers arrived. In most stores, prices were posted on shelves but not on the items themselves.
I've always trusted that the system works well - and I've tapped my foot impatiently when a shopper ahead of me