SUNDAY FUNNIES!! MAD's Supermarkets
Remember, in the 1959s the concept of a big supermarket was new and unique. Things have changed. Now you think those old Mom & Pop stores as a planned antique just to attract people to the store close by or something of that order.
This came from MAD Comicbook #19, art by Jack Davis and editor Harvey Kurtzman wrote the story, but really, the story kind of wrote itself.