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

The history of retail has seen numerous revolutionary moments that transformed how people shop. From ancient marketplaces to digital commerce, retail innovation has shaped economies and societies. This trivia question focuses on a pivotal moment in retail history that changed consumer shopping habits forever and laid the groundwork for today's retail landscape. Test your knowledge about a historic retail innovation that continues to influence modern shopping experiences!

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Piggly Wiggly (the first self-service grocery store)
Woolworth's 5 & 10 (the first fixed-price department store)
Marshall Field's (the first store with a customer return policy)
Sears Roebuck Catalog (the first mail-order retail system)