Which e-commerce innovation has most dramatically increased the market share of independently published books since 2010?

The publishing industry has undergone massive transformations with the rise of e-commerce platforms. These digital marketplaces have changed how authors reach readers, how books are marketed, and how literary works are consumed. This poll tests your knowledge about how modern e-commerce platforms have specifically impacted the world of literature and publishing in recent years.

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Amazon's Kindle Direct Publishing self-publishing platform
Barnes & Noble's NOOK Press digital publishing service
eBay's specialized rare book authentication program
Etsy's handmade book marketplace for artisan publishers