Which marketing innovation by Penguin Books in the 1930s revolutionized book accessibility and became a landmark in publishing history?

The publishing industry has seen numerous innovative marketing strategies over the decades that transformed books into cultural phenomena. Beyond just quality writing, the way books are positioned, packaged, and promoted has evolved dramatically. This poll tests your knowledge of a pivotal marketing innovation that changed how literary works reach audiences.

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Affordable paperback books with standardized cover designs sold in non-traditional locations like drugstores
Celebrity author endorsements on book covers
Money-back guarantee if readers didn't enjoy the book
Subscription-based book delivery service with curated monthly selections