when was elf on the shelf invented

Elf on the Shelf is a modern tradition that dates back to the 1970s. It is a Christmas tradition that involves placing an elf doll in a child's home to keep an eye on them and report back to Santa Claus if they've been good or bad. The elf doll was originally created by Carol Aebersold and Chanda Bell, and it became popular after the release of their book, "Elf on the Shelf: A Christmas Tradition". Since then, the tradition has become a popular way for parents to encourage good behavior in their children during the Christmas season.