Which retail innovation, first introduced in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise rather than requesting items from clerks?

Throughout history, retail innovations have fundamentally changed how people shop and how businesses operate. From ancient marketplaces to modern digital storefronts, retail has evolved with technological and social changes. This trivia question focuses on a pivotal retail innovation that transformed the shopping experience in the early 20th century and set the stage for modern retail formats we know today.

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Piggly Wiggly self-service store
Macy's department store credit card
Sears mail-order catalog delivery service
A&P's price-marking system