Which packaging innovation, introduced in 1935 by Penguin Books, revolutionized the publishing industry by making literature more affordable and accessible to the masses?

The publishing industry has seen numerous innovations in how books are packaged and marketed to readers. One particular revolution in book packaging dramatically altered the way people purchase and consume literature. This trivia question explores a significant packaging innovation that transformed the accessibility and marketability of books in the 20th century, creating a whole new segment of readers and changing how publishers approached the market.

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Mass market paperbacks with standardized designs and lower price points
Hardcover dust jackets with promotional author photographs
Leather-bound collector's editions with gilt-edged pages
Illustrated covers with embossed title typography