Which retail innovation, first introduced in 1916 by Clarence Saunders, fundamentally changed how customers shopped by allowing them to select their own merchandise without clerk assistance?

Throughout history, retail has undergone dramatic transformations that have shaped how we shop today. From ancient marketplaces to modern retail giants, the evolution of commerce reflects technological advances and changing consumer preferences. This trivia question focuses on a pivotal innovation in retail history that revolutionized the shopping experience and set the foundation for modern retail practices.

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Piggly Wiggly self-service store model
Marshall Field's department store layout
Sears Roebuck mail-order catalog system
A&P economy store concept