When Powell's Books pioneered its innovative inventory system in the 1980s, what groundbreaking practice did they introduce that transformed bookselling?

Powell's Books is one of the most iconic independent bookstores in America. Founded in Portland, Oregon, it has grown from a single store to a literary landmark that attracts book lovers from around the world. This trivia question tests your knowledge about the retail history of this influential arts and literature marketplace that changed how independent bookstores operate in the digital age.

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Mixing new and used books on the same shelves, sorted by subject rather than condition
Creating the first bookstore café concept with integrated reading spaces
Implementing the first computerized inventory system for independent bookstores
Establishing the first bookstore loyalty program with tiered membership benefits