Which product innovation in the 1930s revolutionized book publishing by making quality literature more affordable and accessible to the mass market?

The publishing industry has undergone remarkable transformations throughout history, with certain product innovations revolutionizing how literature reaches readers. This trivia question explores a pivotal moment in publishing history that democratized access to books and fundamentally changed how authors connected with their audiences. Test your knowledge about this significant literary business development that shaped modern reading culture.

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Penguin Paperbacks, launched by Allen Lane at sixpence each (the price of a pack of cigarettes)
Book-of-the-Month Club subscription service
Random House's Modern Library imprint
Harper's deluxe leather-bound collector editions