Which retail innovation, introduced in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance for the first time?

Throughout history, retail has evolved dramatically to meet consumer needs. From ancient marketplaces to digital commerce, understanding these pivotal shifts helps us appreciate how consumer behavior and retail strategy have developed over time. This trivia question focuses on a revolutionary moment in retail history that fundamentally changed how consumers interacted with products and shaped modern shopping experiences we take for granted today.

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Self-service grocery stores (Piggly Wiggly model)
Department store catalogs with mail ordering
Coin-operated vending machines
Fixed price tags replacing haggling