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

The way stores are designed has evolved dramatically throughout history, shaping how we shop and interact with products. From the earliest general stores to today's carefully engineered retail experiences, store layouts reflect both cultural shifts and marketing psychology. This trivia question explores a pivotal moment in retail history that changed how stores were organized forever.

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The Piggly Wiggly self-service model
The Marshall Field's department store grid system
The Woolworth's counter-service arrangement
The Sears Roebuck catalog showroom concept