Which retail innovation, first introduced in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The history of retail has seen numerous innovations that transformed how we shop. From ancient marketplaces to modern e-commerce platforms, retail evolution reflects changing societies and technologies. This trivia question explores a pivotal retail innovation that fundamentally changed consumer culture and set the stage for modern shopping experiences. Test your knowledge of retail history and the revolutionary concepts that shaped commerce as we know it today.

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