Which retail innovation, first implemented in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The history of retail is filled with innovative breakthroughs that transformed how we shop. From humble market stalls to global retail empires, the evolution of shopping experiences has been shaped by visionary entrepreneurs and technological advances. This trivia question focuses on a pivotal retail innovation that fundamentally changed consumer behavior in the 20th century and set the stage for modern retail as we know it today.

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Self-service grocery store (Piggly Wiggly)
Department store with multiple specialized sections
Mail-order catalog with home delivery
Membership-based wholesale club