Which literary series created the largest economic retail impact, generating an estimated $25 billion in total merchandise sales worldwide beyond just book revenue?

The publishing industry has seen numerous bestsellers that transformed not only literary culture but entire retail ecosystems around them. These literary phenomena created unprecedented consumer trends, with merchandise, adaptations, and tourism generating billions in revenue. Test your knowledge about the economic impact of major literary sensations and how they revolutionized book retail and consumer product development.

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Harry Potter series by J.K. Rowling
The Lord of the Rings by J.R.R. Tolkien
Twilight series by Stephenie Meyer
Game of Thrones series by George R.R. Martin