Which innovative book packaging format, first widely popularized in the 1930s, made literature more affordable and accessible to the masses through its distinctive smaller size and paper covers?

The publishing industry has seen numerous packaging innovations that have transformed how readers interact with books. From dust jackets to unique cover designs, publishers have continuously evolved their packaging strategies to attract readers and stand out in bookstores. This trivia question focuses on a significant packaging innovation that revolutionized the accessibility and marketability of literature in the 20th century. Test your knowledge about this important development in book publishing history!

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Paperbacks (mass market paperback)
Leather-bound collector's editions
Hardcover books with dust jackets
Folio-sized illustrated editions