Which retail innovation, first widely implemented in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

The history of retail has transformed how we shop and consume products. From ancient marketplaces to modern shopping centers, retail history reveals fascinating innovations that shaped consumer culture. This trivia question focuses on a pivotal development in retail history that revolutionized how products were sold and purchased, changing shopping habits forever. Test your knowledge about this significant retail innovation from the early 20th century!

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Self-service grocery stores (Piggly Wiggly model)
Department store catalogs with home delivery
Coin-operated vending machines for food items
Membership-based retail clubs with bulk purchasing