Which product innovation in publishing was first introduced by Amazon in 2007 and fundamentally changed the economics of self-publishing for authors?

The publishing industry has undergone remarkable transformations in recent decades, with technological innovations reshaping how literature is created, distributed, and consumed. From e-readers to audiobook platforms, subscription services to on-demand printing, the business of books continues to evolve. This trivia question explores one of the most significant product innovations in modern publishing that has changed how authors and readers connect in the literary marketplace.

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Kindle Direct Publishing (KDP)
Audible ACX (Audiobook Creation Exchange)
CreateSpace (now KDP Print)
Goodreads Author Program