Which packaging innovation of the 1930s-40s revolutionized the book industry by making literature more affordable and accessible to working-class readers?

Book packaging design has evolved dramatically over centuries, influencing how readers discover and engage with literature. From ancient scrolls to digital covers, the packaging of written works represents a fascinating intersection of art, marketing, and cultural trends. This trivia question explores a revolutionary moment in book packaging that changed how literature was consumed by the masses and created new reading demographics.

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Paperback books with colorful illustrated covers (Penguin Books, Pocket Books)
Dust jackets with embossed lettering and gold leaf accents
Leather-bound subscription series with marbled endpapers
Boxed hardcover sets with companion reading guides