Which innovative product development strategy did Bloomsbury first introduce with the Harry Potter series that revolutionized literary merchandising?

The publishing industry has evolved beyond simply selling books to creating entire product ecosystems around beloved literary works. From character merchandise to immersive experiences, publishers have transformed how readers engage with stories. This poll tests your knowledge about a pivotal moment in literary product development that changed how books are marketed and sold.

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House-themed collector editions with unique cover designs for each Hogwarts house
Interactive e-books with embedded games and puzzles
Subscription boxes containing exclusive character items and chapter previews
Augmented reality book covers that animated when viewed through a smartphone app