Which retail innovation, launched in 2007, revolutionized the literary market by allowing readers to instantly purchase and access millions of books digitally?

In the world of arts and literature, bookstores have undergone significant retail innovations to survive and thrive in the digital age. From subscription models to experiential shopping, literary retailers have pioneered creative approaches to keep physical books relevant. Test your knowledge about a major retail innovation that transformed how we discover and purchase literature!

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Amazon's Kindle and Kindle Store ecosystem
Barnes & Noble's Nook Color touchscreen reader
Apple's iBooks and integrated publishing platform
Google's Play Books subscription service