Which publisher first successfully mass-marketed paperback books in the 1930s, making literature more affordable and accessible to the general public?

The way books are packaged and presented to consumers has evolved dramatically over centuries. From ancient scrolls to modern e-books, packaging decisions have influenced reader experience and marketing success. This question explores how a famous publisher revolutionized book accessibility through innovative packaging that changed reading habits worldwide.

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Penguin Books
Random House
HarperCollins
Simon & Schuster