How paperbacks changed the book world.

From mental_floss:

Quantity was key. De Graff knew that if he could print 100,000 paperbound books, production costs would plummet to 10 cents per copy. But it would be impossible for Pocket Books to turn a profit if it couldn’t reach hundreds of thousands of readers. And that would never happen as long as de Graff relied solely on bookstores for distribution. So de Graff devised a plan to get his books into places where books weren’t traditionally sold. His twist? Using magazine distributors to place Pocket Books in newsstands, subway stations, drugstores, and other outlets to reach the underserved suburban and rural populace. But if Pocket Books were going to sell, they couldn’t just stick to the highbrow. De Graff avoided the stately, color-coded covers of European paperbacks, which lacked graphics other than the publishers’ logos, and splashed colorful, eye-catching drawings on his books.