Which product design innovation in the 1930s dramatically increased book accessibility and is credited with democratizing literature during the Great Depression era?

The publishing industry has undergone significant transformations in product design over the decades. From traditional hardcovers to interactive e-books, the way literature reaches consumers continues to evolve through innovative product design strategies. This poll tests your knowledge about a pivotal moment in book product design that revolutionized reading accessibility and publishing markets worldwide.

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Paperback books (Pocket Books, founded 1939)
Book club subscriptions (Book-of-the-Month Club)
Audiobooks on vinyl records
Illustrated dust jackets for hardcover books