Which retail innovation, first introduced in the 1930s, revolutionized store layouts by allowing customers to browse and select products themselves rather than requesting items from clerks?

The history of retail is filled with pivotal innovations that transformed how we shop. From the first department stores to revolutionary pricing models, each advancement shaped consumer culture and business practices. This trivia question explores a key turning point in retail history that fundamentally changed how products were displayed and sold to the public, creating the foundation for modern shopping experiences we know today.

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Self-service grocery stores (pioneered by Piggly Wiggly)
Department store catalogs with mail-order capabilities
Coin-operated vending machines for consumer goods
Membership-based retail clubs with bulk purchasing