Which children's book series has generated the highest retail merchandising revenue in history, with products ranging from theme parks to clothing lines?

The publishing industry has evolved far beyond just selling books. Today, successful authors and publishers create entire product ecosystems around beloved literary works. From themed merchandise to experiential retail spaces, literature-based product marketing has become a billion-dollar industry. Test your knowledge about the commercial side of the literary world and discover how books have transformed into full-fledged retail empires.

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