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

The evolution of store layouts has significantly shaped shopping behaviors throughout history. From ancient marketplaces to modern retail environments, the strategic arrangement of merchandise has been a critical factor in commerce success. This trivia question explores a pivotal innovation in retail store design that fundamentally changed how consumers interact with products and ultimately revolutionized the shopping experience worldwide.

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Self-service grocery format (pioneered by Piggly Wiggly)
Department store model (pioneered by Bon Marché)
Shopping mall concept (pioneered by Southdale Center)
Catalog showroom format (pioneered by Service Merchandise)