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

Test your knowledge of retail history! The evolution of retail strategies has dramatically transformed how businesses connect with customers over the centuries. From ancient marketplaces to today's omnichannel experiences, retail innovation has always been driven by changing consumer behaviors and technological advancements. This question focuses on a pivotal moment that revolutionized retail strategy in the early 20th century.

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Piggly Wiggly's self-service grocery store model
Macy's department store catalog system
Woolworth's fixed-price merchandising approach
Sears Roebuck's mail-order distribution network