Which packaging innovation, first widely introduced in 1935, revolutionized the book industry by making literature more affordable and portable for mass consumption?

The publishing industry has seen numerous innovations in how books are packaged and presented to readers over the centuries. From scrolls to codices to modern formats, packaging has profoundly impacted how we consume literature. This trivia question focuses on a revolutionary packaging innovation that transformed the accessibility and popularity of books in the 20th century.

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• Penguin's color-coded paperback format
• Leather-bound collector's editions with gold leaf pages
• The dust jacket with promotional blurbs
• The first hardcover book club subscription box

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