Which marketing innovation by Bloomsbury Publishers for the Harry Potter series is credited with creating a new publishing industry standard that continues today?

The publishing industry has created some of the most innovative product marketing campaigns in history, transforming books from simple reading material into global cultural phenomena. From midnight release parties to viral online campaigns, publishers have revolutionized how literature is marketed to the masses. Test your knowledge about some of the most successful book marketing strategies that helped turn ordinary releases into extraordinary bestsellers and literary landmarks.

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Adult and children's cover variants for the same book
Character-specific bookmarks included with each purchase
Monthly subscription boxes with series merchandise
Interactive website quizzes to determine your Hogwarts house