Which packaging innovation in the 20th century most significantly boosted mass-market fiction sales and created a new category of portable literature?

The publishing industry has undergone significant transformations in how books are packaged and presented to consumers. Packaging innovations have dramatically influenced reader behavior, sales strategies, and even how authors approach their craft. This trivia question explores a pivotal packaging innovation that revolutionized a specific segment of the literary market, making books more accessible to new audiences and transforming reading habits worldwide.

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The introduction of paperback books with eye-catching illustrated covers in the 1930s-40s
The development of cloth-bound hardcover books with dust jackets in the 1910s
The creation of leather-bound collector's editions with gilt edges in the 1950s
The implementation of plastic book shrink-wrapping technology in the 1970s