Which grocery store layout innovation, introduced in the 1930s but becoming widespread by the 1950s, fundamentally changed food retail by allowing customers to select their own products rather than requesting them from clerks?

The layout of grocery stores isn't random—it's a carefully crafted customer journey designed to maximize sales and enhance shopping experiences. Over the decades, store layouts have evolved significantly based on consumer psychology, technology, and changing shopping habits. This trivia question explores a fascinating shift in modern grocery store design that revolutionized the traditional shopping experience.

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Self-checkout lanes
Perimeter shopping (fresh foods around the outer edge)
Self-service shopping
Express lanes for customers with fewer items