Which retail innovation, first widely implemented in the 1910s-1920s, eliminated clerk-assisted shopping and allowed customers to select their own merchandise for the first time?

Test your knowledge about one of history's most significant retail innovations that fundamentally changed how consumers shop! This development transformed the retail landscape in the early 20th century and set the foundation for today's shopping experiences. While seemingly commonplace today, this innovation revolutionized consumer behavior and retail strategies when first introduced.

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Department stores with multiple specialized sections (like Macy's expansion in 1902)
Mail-order catalogs with home delivery (like Montgomery Ward's 1872 catalog)
Chain stores with standardized inventory (like A&P's expansion in the 1890s)