Which retail innovation, first implemented in 1916, fundamentally transformed store layouts by allowing customers to select their own merchandise without clerk assistance?

The way we shop has evolved dramatically over centuries, with key innovations transforming the retail landscape. Store layouts in particular have been scientifically engineered to influence consumer behavior. This trivia question explores a pivotal moment in retail history that forever changed how products are presented and how customers interact with merchandise. Test your knowledge about the revolutionary discovery that shaped modern shopping environments!

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Self-service shopping (Piggly Wiggly's innovation)
The shopping mall concept (Southdale Center)
Department store floor plan (Marshall Field's design)
The checkout counter system (F.W. Woolworth's invention)