Which product innovation in literature was initially rejected by the Authors Guild as it would 'ultimately destroy the book industry' but later became a billion-dollar market segment?

Throughout history, the publishing industry has undergone remarkable transformations in how literature is produced, distributed, and consumed. From scrolls to codices, from handwritten manuscripts to mass printing, and from physical books to digital formats—the 'product' of literature has constantly evolved. This trivia tests your knowledge about a pivotal innovation that changed how we interact with literature in modern times.

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Audiobooks
Print-on-demand publishing
Interactive e-books with multimedia elements
Subscription-based reading services