Which innovative book format, first popularized in the 1930s by Penguin Books, revolutionized reading by making quality literature more affordable and portable?

Throughout history, the packaging of literature has evolved dramatically, influencing how we access and experience stories. From scrolls to codices to modern formats, certain innovations in book packaging have revolutionized the literary world and reading habits. This trivia question explores a pivotal moment in the evolution of book design that transformed literature's accessibility and popularity.

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Mass-market paperbacks with standardized cover designs
Leather-bound subscription series with gold embossing
Illustrated cloth-covered hardbacks with dust jackets
Serialized newspaper literature collections