Which product innovation first allowed Amazon to disrupt the traditional bookstore model and eventually transform into the world's largest online retailer?

The publishing industry has undergone dramatic transformations with digital innovations reshaping how readers discover, purchase, and consume literature. From recommendation algorithms to innovative sales platforms, technology has created new opportunities for authors and readers alike. Test your knowledge about a groundbreaking retail innovation that changed the literary marketplace forever.

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The Kindle e-reader (2007)
The patented 1-Click purchase system (1999)
Amazon Prime subscription service (2005)
The customer review system (1995)