Which retail innovation from the 1930s revolutionized shopping by allowing customers to select their own merchandise without clerk assistance for the first time?

Throughout history, retail has evolved dramatically from simple trading posts to complex omnichannel experiences. This trivia question explores a pivotal innovation that fundamentally changed how retailers operated and how consumers shopped. Understanding these historical shifts helps product managers appreciate the evolutionary nature of retail challenges and solutions. Test your knowledge of retail history with this challenging question!

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Self-service grocery store (pioneered by Piggly Wiggly)
Mail-order catalogs (popularized by Montgomery Ward)
Department store concept (developed by Macy's)
Charge cards (introduced by Bloomingdale's)