Which innovative book packaging format, introduced in the 1930s, revolutionized the publishing industry by making literature more accessible and affordable to mass audiences?

The publishing industry has seen numerous packaging innovations that transformed how books are marketed and consumed. From dust jackets to special editions, publishers have used product packaging to attract readers and differentiate titles in crowded bookstore shelves. This trivia question explores a significant packaging innovation that changed the book retail landscape and consumer purchasing behavior in the 20th century.

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Mass market paperbacks (Pocket Books)
Leather-bound collector's editions
Hardcover books with removable dust jackets
Folio Society illustrated editions