Which retail innovation, first widely implemented in the 1930s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Retail innovation has transformed how consumers interact with products and brands over the decades. From self-service concepts to experiential stores, retailers have continuously evolved their approaches to attract and retain customers. This trivia question focuses on a pivotal innovation that fundamentally changed retail strategy and consumer behavior in the 20th century. Test your knowledge of retail history and the transformative concepts that shaped modern shopping experiences.

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Shopping carts (introduced by Sylvan Goldman for his Humpty Dumpty supermarket chain in 1937)
Self-service grocery stores (popularized by Piggly Wiggly founder Clarence Saunders in the 1930s)
Department store mannequins (standardized for mass retail display in the 1930s)
Retail loyalty programs (first modern program introduced by Betty Crocker in 1929)