Which revolutionary pricing strategy, introduced in 1935, made quality literature more accessible to the masses by standardizing book prices at an affordable level?

In the publishing industry, pricing strategies can make or break a book's success. Publishers must balance accessibility with profitability, while considering the unique value proposition of each title. This trivia question explores a famous pricing innovation that revolutionized how literature reached the masses and democratized reading. Test your knowledge of this pivotal moment in publishing history that changed how we consume books!

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Penguin Paperbacks' standard price of sixpence (6d)
Barnes & Noble's 'Half-Price Hardcovers' campaign
Book-of-the-Month Club's subscription model
Amazon's '$9.99 e-book' pricing structure