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 behind counters?

Throughout history, retail has undergone dramatic transformations that fundamentally changed how people shop. From ancient marketplaces to modern digital commerce, innovative store layouts and merchandising techniques have shaped consumer behavior and business success. This trivia question focuses on a pivotal historical development in store design that revolutionized the retail industry and continues to influence modern shopping experiences.

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Self-service shopping (pioneered by Piggly Wiggly)
The department store model (introduced by Macy's)
The shopping mall concept (developed by the Southdale Center)
The catalog showroom format (popularized by Service Merchandise)