Which innovative book packaging format, introduced in the 1930s, made literature more affordable and accessible to the masses, leading to what's often called the 'Paperback Revolution'?

Throughout history, book packaging has evolved dramatically, influencing how we access and experience literature. From traditional hardcovers to modern innovations, packaging in publishing has shaped reading habits, book accessibility, and even literature itself. This trivia question explores a groundbreaking packaging innovation that revolutionized reading for millions and created a whole new market segment in the publishing industry.

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Penguin Books' standardized paperback format, launched by Allen Lane at sixpence per book
The Book-of-the-Month Club subscription model with custom dust jackets
The Little Blue Books series with their pocket-sized dimensions
The Modern Library's uniform hardcover editions with flexible bindings