Which historical retail innovation, introduced in the 1930s, fundamentally changed shopping behavior by allowing consumers to select their own merchandise without clerk assistance?

Throughout history, retail has undergone remarkable transformations that shaped how we shop today. From ancient marketplaces to modern e-commerce, innovative retail strategies and consumer trends have continuously evolved. This trivia question focuses on a pivotal historical moment in retail that revolutionized shopping behavior and established a foundation for modern retail practices. Test your knowledge of how past retail innovations continue to influence today's shopping experiences!

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Self-service shopping (the modern supermarket concept)
Mail-order catalogs with home delivery
Department stores with fixed pricing
Retail loyalty card programs