Which packaging innovation, introduced in the 1930s, revolutionized the book industry by making literature more affordable and accessible to the masses?

In the publishing world, how a book is presented can be just as important as its content. Book cover design and packaging has evolved dramatically over the centuries, with certain innovations becoming industry game-changers. Test your knowledge about a pivotal moment in literary product packaging that transformed how readers interact with books and significantly expanded the market for literature.

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Paperback books (Penguin Books' affordable color-coded system)
Dust jackets with promotional text and author photos
Foil-stamped hardcover editions with embossing
Leather-bound collector's editions with gilt edges