Which retail technology innovation has specifically been credited with revitalizing independent bookstores in the past decade?

The publishing industry has embraced technology to create innovative product packaging and marketing strategies for books and literary works. Modern bookstores and online retailers are using advanced techniques to attract readers in an increasingly digital world. How well do you know the intersection of literature and retail technology? Test your knowledge about how books are marketed, packaged, and sold in today's tech-driven marketplace.

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Print-on-demand machines that allow bookstores to print any book on site
Inventory management systems that allow for curated, smaller selections competing against Amazon
Augmented reality displays that let customers see animated book covers
Blockchain technology for tracking first editions and signed copies