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

The history of retail has been shaped by bold innovators who transformed how we shop. From small general stores to massive department stores and eventually online marketplaces, retail history reflects broader social and economic changes. This trivia question focuses on a pivotal moment in retail history that changed shopping forever and set the foundation for today's retail giants.

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Piggly Wiggly's self-service grocery store model
Sears catalog's mail-order shopping system
Marshall Field's department store return policy
F.W. Woolworth's fixed-price merchandise model