Which retail innovation, first introduced in the 1930s, revolutionized the customer shopping experience by allowing shoppers to select their own merchandise without clerk assistance?

The retail landscape we know today evolved through centuries of innovation. From ancient marketplaces to digital storefronts, retail strategies and technologies have transformed how humans buy and sell goods. This trivia question focuses on a pivotal moment in retail history that fundamentally changed the customer shopping experience and set the stage for modern merchandising practices we take for granted today.

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Self-service shopping carts
Department store credit cards
Mail-order catalogs with photographs
Electric cash registers