Which retail technology innovation, first widely implemented in department stores during the 1920s-1930s, revolutionized the shopping experience by eliminating the need for clerk assistance for each purchase?

Department stores revolutionized shopping in the 19th century and continue to evolve today. These retail pioneers introduced fixed pricing, diverse merchandise under one roof, and innovative customer experiences that shaped modern commerce. Test your knowledge about a groundbreaking retail technology that transformed the shopping experience during the early 20th century and set the foundation for today's consumer expectations.

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Self-service shopping carts
Cash registers with receipt printing
Self-service merchandise displays
Electric elevator systems