Which retail innovation, first introduced in the 1910s, revolutionized customer experience by allowing shoppers to select their own merchandise without clerk assistance?

The way we shop today has been shaped by centuries of retail innovation and evolution. From ancient marketplaces to digital storefronts, retail customer experience has undergone dramatic transformations. This trivia question explores a pivotal moment in retail history that fundamentally changed how customers interact with products and make purchasing decisions. Test your knowledge about a revolutionary retail concept that continues to influence modern shopping experiences.

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Self-service grocery stores (Piggly Wiggly)
Department store loyalty cards
Mail-order catalogs with cash-on-delivery
Automated vending machines