Which e-commerce feature, first widely popularized by Amazon for books, fundamentally changed how readers discover new titles and authors?

The publishing industry has undergone dramatic transformation with the rise of digital platforms and e-commerce. From traditional bookstores to online marketplaces, how we discover, purchase, and consume literature has fundamentally changed. This poll tests your knowledge about a significant e-commerce innovation that revolutionized the literary world and continues to influence publishing trends, reader behavior, and author careers to this day.

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Algorithm-based recommendation systems ("Customers who bought this also bought...")
One-click purchasing patents
Dynamic pricing based on demand
Self-publishing platforms with print-on-demand