Which retail innovation was NOT introduced in the 1930s despite the economic challenges of the Great Depression?

Throughout history, retail innovations have fundamentally changed how we shop and interact with products. From the first department stores to modern e-commerce giants, these breakthroughs have shaped consumer culture and business practices worldwide. Test your knowledge about the pioneers behind some of the most transformative retail innovations that revolutionized the industry and set standards we still follow today.

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Supermarket shopping carts (invented by Sylvan Goldman for his Humpty Dumpty supermarket chain)
Self-service grocery stores (pioneered by Clarence Saunders with Piggly Wiggly)
Price-marked merchandise (introduced by Michael Cullen with King Kullen stores)
Checkout stands with conveyor belts (developed by the Kroger grocery chain)