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

Throughout history, retail innovations have transformed how we shop and consume products. From ancient marketplaces to today's digital commerce, the evolution of retail tells us much about social changes, technological advancements, and economic development. This trivia question focuses on a pivotal moment in retail history that changed shopping forever and set the foundation for modern consumer culture.

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Self-service grocery stores (Piggly Wiggly)
Department stores (Macy's expansion)
Mail-order catalogs (Sears Roebuck)
Chain store model (A&P stores)