Which retail innovation, first implemented in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

Before the conveniences of modern shopping, retail was a vastly different experience. The history of retail innovations has transformed how we interact with products and brands. This trivia question explores a pivotal moment in retail history that changed shopping forever. Test your knowledge about the evolution of the retail landscape and how one innovation revolutionized consumer purchasing behavior in the early 20th century.

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Self-service grocery store (Piggly Wiggly)
Department store catalog ordering (Sears)
Automated vending machines (Horn & Hardart Automat)
Coin-operated retail displays (F.W. Woolworth)