Which retail layout innovation, first introduced in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Throughout history, retail has undergone dramatic transformations in response to technological innovations, changing consumer behaviors, and economic shifts. From ancient marketplaces to modern e-commerce giants, the evolution of retail tells a fascinating story of human commerce and innovation. This trivia question focuses on a pivotal moment in retail layout innovation that fundamentally changed how consumers interact with products.

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Self-service grocery store (Piggly Wiggly)
Department store product categorization (Marshall Field's)
Circular store layout with central cashier (A&P)
Catalog showroom model (Sears Roebuck)