Which retail innovation, introduced in the 1930s, fundamentally changed shopping habits by allowing customers to select their own merchandise without clerk assistance for the first time?

The history of retail has been marked by transformative innovations that have shaped how we shop today. From ancient marketplaces to modern e-commerce platforms, retail evolution reflects broader societal and technological changes. This poll tests your knowledge of a pivotal moment in retail history that revolutionized consumer psychology and shopping habits. Do you know how our ancestors shopped and what innovations changed the retail landscape forever?

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Self-service shopping carts (introduced by Sylvan Goldman at Humpty Dumpty Supermarkets)
Self-service grocery stores (pioneered by Piggly Wiggly's Clarence Saunders)
Department store catalog showrooms (popularized by Sears Roebuck)
Coin-operated vending machines (expanded by Horn & Hardart's Automat restaurants)