Which packaging innovation in the 1930s revolutionized the book industry by making literature more accessible and affordable to the general public?

Book packaging design has evolved dramatically throughout publishing history, sometimes revolutionizing how readers interact with literature. From dust jackets to innovative materials, the physical presentation of books has played a crucial role in their commercial success and cultural impact. This trivia question explores a pivotal moment when packaging innovation transformed the literary marketplace and reading habits worldwide.

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Penguin Books' standardized paperback design with color-coded genres
Dust jackets with elaborate foil embossing
Leather-bound collector's editions with gilded edges
Hardcover books with transparent acetate covers