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In this episode of Overrated, Vox's Phil Edwards investigates the largely unheralded business reason behind the success of Harper Lee's "To Kill A Mockingbird."

Harper Lee's To Kill A Mockingbird is a literary classic, but it was also a landmark book in the paperback revolution. Thanks to publishers like Penguin Books, paperbacks changed dramatically from pulp fiction and dime store novels to a a legitimate way to read great literature.

To Kill A Mockinbird's timing helped it capitalize upon that business shift and become a classic in classrooms — for business reasons as well as literary ones.

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