What retail innovation, first introduced in 1916 by Clarence Saunders, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

The retail landscape we know today evolved through centuries of innovation. From small market stalls to department stores to e-commerce giants, retail history reveals how shopping has transformed alongside society. This trivia question explores a pivotal moment that forever changed how consumers interact with products and shaped modern retail practices. Test your knowledge of retail history and see if you can identify this revolutionary retail concept!

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Self-service grocery store (Piggly Wiggly)
The department store catalog system
Coin-operated vending machines
The shopping mall concept