Which retail innovation, first implemented in 1916, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The retail landscape we know today evolved through centuries of innovation. From ancient marketplaces to modern shopping experiences, retail history reveals fascinating strategies that shaped consumer behavior. This trivia question explores a pivotal moment in retail history that fundamentally changed how products were sold and marketed to consumers. Test your knowledge of this transformative retail innovation that continues to influence shopping experiences today.

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Self-service grocery stores (Piggly Wiggly)
Mail-order catalogs (Sears Roebuck)
Department stores (Macy's)
Discount chains (Woolworth's)