Which retail innovation is credited with revolutionizing the book industry in the late 1990s by introducing algorithmic product recommendations for readers?

The publishing industry has undergone significant transformation through retail innovation and technology. From traditional bookstores to digital platforms, the way literature reaches consumers has evolved dramatically. This trivia question explores a pivotal moment in book retail history that changed how readers discover and purchase literature, highlighting the intersection of product innovation and literary commerce.

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Amazon's 'Customers Who Bought This Also Bought' recommendation system
Barnes & Noble's 'Discover' in-store kiosks
Borders' 'Personal Book Shopper' loyalty program
Goodreads' social reading network (originally launched as an independent platform)