Which pricing innovation, introduced in the 1930s, revolutionized book accessibility by making quality literature more affordable for the average reader?

The publishing world has seen various pricing strategies evolve over centuries. From subscription models of the Victorian era to today's digital pricing innovations, how books are priced reflects cultural values, market forces, and technological changes. Test your knowledge of a fascinating pricing phenomenon that significantly impacted the literary marketplace and changed how we access books.

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Penguin Paperbacks' uniform pricing model (sixpence per book)
Book-of-the-Month Club subscription service
Public library lending fee system
Graduated pricing based on page count