Which packaging innovation in literature is credited with creating the modern mass-market paperback industry in the 1930s, making books more affordable and accessible to the general public?

In the world of literature, content isn't the only thing that matters—packaging innovations have revolutionized how we interact with books. From dust jackets to e-readers, the evolution of book packaging has shaped reading experiences and publishing economics. This trivia question explores a game-changing packaging innovation that transformed the literary marketplace and reading habits worldwide. Test your knowledge about the business side of literature!

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Penguin Books' standardized color-coded covers and uniform sizing
Barnes & Noble's leather-bound classics collection with gilt edges
Random House's introduction of the dust jacket with promotional text
Simon & Schuster's introduction of the hardcover book club edition