Which innovative book format, introduced in 1935, represented a major product development breakthrough that made literature more affordable and accessible to the masses?

The publishing industry has undergone remarkable transformations in how literature reaches consumers. From traditional hardcovers to cutting-edge digital innovations, product development in publishing has reshaped how we experience stories. This trivia question explores a significant product development milestone that revolutionized reading accessibility and changed the publishing landscape forever.

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Paperback books (Penguin Books' first mass-market paperbacks)
Audiobooks on vinyl records
Book-of-the-Month Club subscription service
Illustrated comic books with literary adaptations