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?

The history of retail contains fascinating innovations that transformed how we shop. From small general stores to massive department stores, shopping malls, and now e-commerce giants, retail has continuously evolved to meet consumer needs. This trivia question focuses on a pivotal retail innovation that changed shopping habits forever and set the stage for modern consumer culture.

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Piggly Wiggly self-service grocery store
Sears mail-order catalog
Marshall Field's bargain basement
A&P economy store concept