Which retail innovation fundamentally transformed book marketing in the early 2000s by using advanced recommendation algorithms based on customer reading patterns?

The world of literature retail has transformed dramatically in recent years. From traditional bookstores to innovative digital platforms, the way readers discover and purchase books has evolved through creative marketing approaches and technology integration. This poll tests your knowledge about a significant retail innovation that changed how literary works are marketed and sold to consumers. Can you identify which revolutionary concept truly disrupted the industry?

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Amazon's 'Customers Who Bought This Also Bought' recommendation engine
Barnes & Noble's 'Nook First Look' preview program
Borders' 'Personal Book Shopper' in-store kiosk system
Waterstones' 'Literary Match' subscription box service