Which packaging innovation, introduced in the 1930s, revolutionized the book industry by making literature more affordable and accessible to the masses?

The book publishing industry has seen numerous innovations in packaging over the decades. From dust jackets to special editions, publishers have continuously evolved how they present literature to consumers. One particular packaging innovation revolutionized the accessibility of literature for millions of readers. Test your knowledge about this significant development in literary retail history!

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Paperback books (mass market paperbacks)
Hardcover books with removable dust jackets
Leather-bound collector's editions
Cloth-bound library editions