Which innovative book pricing strategy was pioneered by Penguin Books in the 1930s that revolutionized the publishing industry and made literature more accessible to the masses?

The publishing industry has evolved dramatically in how books are priced and marketed. From traditional hardcover releases to e-books and subscription models, pricing strategies in literature reflect changing consumer habits, technological disruptions, and market pressures. This trivia question explores a fascinating aspect of book pricing that has shaped how publishers position their literary offerings in an increasingly competitive marketplace.

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Paperback books at standardized low prices (sixpence, about the same price as a pack of cigarettes)
Book club subscriptions with monthly discounted releases
Dynamic pricing based on book popularity rankings
Buy-one-get-one-free promotional campaigns for bestsellers