Which product innovation caused the biggest one-year increase in e-book sales, with a 1,260% growth in the US market following its introduction?

The publishing industry has undergone remarkable transformations through product innovations that have changed how we consume literature. From traditional hardcovers to digital formats, these innovations have shaped reading habits and accessibility of literary works. Test your knowledge about pivotal product innovations in the world of literature and publishing that revolutionized how we interact with books and other written content.

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Amazon Kindle (2007)
Apple iBooks (2010)
Sony Reader (2006)
Barnes & Noble Nook (2009)