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

The book industry has undergone significant transformations in how literature is packaged and presented to consumers. From traditional hardcovers to innovative digital formats, product packaging in publishing has evolved to meet changing reader preferences and technological advancements. This trivia question explores a pivotal moment in book packaging history that dramatically changed how readers consume literature and impacted the entire publishing industry.

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Paperback books (aka pocket books)
Leather-bound collector's editions
Book-of-the-month subscription boxes
Dust jackets with promotional artwork