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

The history of retail has transformed how we purchase goods over centuries. From small trading posts to global empires, retail innovations have shaped economies and cultures worldwide. This trivia question explores a pivotal moment in retail history that changed how consumers interacted with products and created the foundation for modern shopping experiences we know today.

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Self-service grocery stores (Piggly Wiggly)
Department stores with multiple product categories
Mail-order catalogs with home delivery
Chain stores with standardized pricing