Which book packaging innovation, introduced in the 1930s but popularized in the 1950s, revolutionized the publishing industry by making literature more affordable and portable for mass consumption?

In the publishing world, book packaging isn't just about aesthetics—it's about marketing, brand identity, and reader psychology. One particular innovation in book packaging transformed how readers interact with certain literary works, making them more accessible and portable while creating a distinct market segment. Test your knowledge of this significant development in literary product packaging that changed reading habits worldwide.

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Mass market paperbacks (pioneered by Penguin Books)
Leather-bound collector's editions with gilt edges
Dust jackets with embossed author signatures
Hardcover books with integrated bookmarks