Which retail innovation, first introduced in 1916, revolutionized customer experience by allowing shoppers to select their own merchandise without clerk assistance?

The retail landscape has evolved dramatically throughout history, transforming from simple bartering systems to sophisticated shopping experiences. This trivia question explores a pivotal moment in retail history that forever changed how customers interact with products and brands. Test your knowledge about a revolutionary retail concept that fundamentally altered consumer behavior and established practices we now take for granted.

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Self-service grocery stores (Piggly Wiggly)
Department store catalogs (Sears Roebuck)
Coin-operated vending machines (Horn & Hardart Automat)
Home shopping via telephone orders (Montgomery Ward)