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

The history of retail is filled with fascinating innovations and transformative events that shaped how we shop today. From ancient marketplaces to modern shopping experiences, retail history reflects broader cultural and economic trends. This trivia question focuses on a pivotal moment in the evolution of American retail that fundamentally changed consumer shopping habits and revolutionized the industry. Test your knowledge about this significant retail transformation!

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Self-service grocery store (Piggly Wiggly)
Department store with fixed pricing (Macy's)
Mail-order catalog shopping (Montgomery Ward)
Roadside convenience store (7-Eleven)