Which product innovation is credited with making books affordable to the middle class for the first time in history?

The publishing industry has undergone significant transformations over the centuries. From handwritten manuscripts to printed books, and now digital formats, product innovation has continuously reshaped how literature reaches readers. This trivia question tests your knowledge about a pivotal innovation in book publishing that dramatically changed the literary landscape and democratized access to written works.

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• The invention of the paperback book by Penguin Books in 1935
• Amazon's introduction of the Kindle e-reader in 2007
• The development of print-on-demand technology in the 1990s
• The creation of public libraries with lending systems in the 1800s

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