Which retail innovation did Amazon initially launch with in 1995, forever changing how literature is marketed and sold?

The book retail landscape has dramatically evolved over the decades, with major players disrupting how readers discover and purchase literature. From independent bookshops to massive chains to online marketplaces, the way authors' works reach their audience has transformed through innovative retail strategies. This trivia tests your knowledge about a significant retail innovation that changed the literary marketplace forever.

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A recommendation algorithm that suggested books based on previous purchases
An online-only bookstore, selling books at discounted prices before expanding to other products
Self-publishing platform that allowed authors to bypass traditional publishers
Subscription-based model offering unlimited access to digital books for a monthly fee