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

The history of retail has been shaped by groundbreaking innovations that transformed how consumers interact with products and brands. From ancient marketplaces to digital storefronts, retail evolution reflects broader societal changes. This trivia question focuses on a pivotal retail innovation that fundamentally changed consumer behavior and set the stage for modern shopping experiences. Test your knowledge about this transformative moment in retail history!

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Self-service grocery stores (Piggly Wiggly model)
Department store catalogs with mail-order purchasing
Coin-operated vending machines for retail goods
Installment payment plans for expensive merchandise