Which retail innovation, introduced in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise rather than requesting items from clerks?

Test your knowledge of retail innovation history! The evolution of shopping has transformed dramatically over centuries, with technological breakthroughs and creative strategies reshaping how consumers interact with products. From ancient marketplaces to digital storefronts, retail has continually adapted to changing times. This question examines a pivotal retail innovation that fundamentally changed shopping behavior and set the foundation for modern retail experiences.

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Self-service grocery store (Piggly Wiggly)
Department store with price tags (Macy's)
Mail-order catalog shopping (Montgomery Ward)
Automated vending machines (Horn & Hardart)