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

The retail industry has undergone dramatic transformations throughout history. From ancient marketplaces to modern shopping malls, the evolution of how products are sold has shaped economies and cultures. This trivia question focuses on a pivotal moment in retail history that revolutionized the shopping experience and established a foundation for modern retail strategies. Test your knowledge about this significant retail innovation that changed how consumers interact with products and brands.

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Self-service grocery stores (like Piggly Wiggly)
Mail-order catalogs (like Sears Roebuck)
Department stores (like Macy's)
Membership discount clubs (like early versions of Costco)