Which packaging innovation in the publishing industry is credited with dramatically increasing book ownership in the 1930s by making literature more affordable to the masses?

The way books are packaged and presented has evolved dramatically over centuries, with some innovations revolutionizing how we interact with literature. From ancient scrolls to modern e-readers, packaging decisions have shaped reading experiences and accessibility. This trivia question explores a pivotal packaging innovation that transformed the literary marketplace and reading habits. Test your knowledge of how product design intersects with literary history!

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Penguin Books' color-coded paperback system with standardized covers
Random House's dust jacket with illustrated front covers
Harper Collins' introduction of the hardcover boxed set
Simon & Schuster's development of the leather-bound collector's edition