Which packaging innovation, introduced in the 1930s, revolutionized the book industry by making literature more affordable and portable for the average consumer?

The publishing industry has seen numerous innovations in how books are presented to consumers. From dust jackets to special editions, packaging plays a crucial role in attracting readers and collectors alike. This trivia question explores a significant packaging innovation that changed how we interact with certain literary works, making them more accessible to a wider audience.

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Paperback books (mass market format)
Dust jackets with promotional artwork
Foil-stamped hardcover editions
Box sets with companion materials