Which book series pioneered modern literary merchandising by generating over $7 billion in product sales beyond books, fundamentally changing how publishers approach product development?

Before the age of movie merchandise and franchise collectibles, books themselves were the primary products of the literary world. However, in the late 20th century, a revolutionary shift occurred when one particular book series transformed publishing into a multi-product industry with unprecedented merchandising success. Test your knowledge about this pivotal moment in literary product development that forever changed how books are marketed and sold.

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