We take it for granted now that we can go into a supermarket and pick our own food, but that hasn’t always been the case.
The Piggly Wiggly store at 79 Jefferson Avenue, Memphis, Tennessee, which was supposed to open on 6 September 1916, but didn't welcome customers until 11 September due to last minute construction delays, was the world’s first self-service supermarket.
Before that customers had to give their shopping lists to the clerks, who would then pick out the goods. Thus, food was more expensive due to higher staff costs.