Which retail innovation, introduced in the 1920s, revolutionized shopping by allowing consumers to select their own merchandise without clerk assistance for the first time?

Throughout history, retail innovations have transformed how people shop and consume. From ancient marketplaces to modern malls, these innovations reflect changing societies and economies. This trivia question focuses on a pivotal moment in retail history that fundamentally changed consumer culture and shopping habits. Test your knowledge of how our shopping experiences evolved through the centuries!

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Self-service grocery stores (like Piggly Wiggly)
Department stores with multiple floors
Mail-order catalogs with home delivery
Installment payment plans for major purchases