Which e-commerce innovation by Amazon specifically designed for the literary market caused traditional bookstores to lose significant market share in the early 2010s?

The publishing industry has undergone dramatic transformations with the rise of e-commerce. Traditional bookstores, online retailers, and digital platforms have created a complex ecosystem for authors and publishers. This trivia question explores how a major e-commerce innovation disrupted the traditional book retail landscape and changed how readers discover and purchase literature.

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Kindle Direct Publishing (KDP)
Kindle Unlimited subscription service
Amazon Prime Reading
AbeBooks acquisition