Which innovative book packaging format, introduced in the 1930s, dramatically lowered the cost of books and made literature more accessible to the masses?

Book packaging and presentation has evolved dramatically over centuries, from hand-illuminated manuscripts to today's interactive e-books. Publishers continually innovate in how literature is packaged, presented, and marketed to readers. This poll tests your knowledge of a groundbreaking packaging innovation that revolutionized reading access and helped democratize literature. Consider how product design choices can transform entire industries and consumer behaviors.

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Paperback books (Penguin Books pioneered the mass-market quality paperback)
Leather-bound subscription series (Book-of-the-Month Club editions)
Illustrated dust jackets (Scribner's ornate cover designs)
Spiral-bound editions (Oxford's lay-flat reference books)