Which product innovation in the publishing industry is credited with making books widely affordable to the general public for the first time in the 1930s?

Before the digital revolution transformed how we consume literature, several physical product innovations dramatically changed reading habits and accessibility. This trivia question explores a pivotal moment in literary history when a product innovation democratized access to books and literature, transforming them from luxury items to everyday commodities. Test your knowledge about this significant shift in publishing history!

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Penguin Books' standardized paperbacks with their distinctive orange covers
Book-of-the-Month Club subscription service
Modern Library's hardcover classics series
Random House's illustrated fiction collections