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

The history of retail has seen dramatic transformations that shaped how people shop and how products are sold. From ancient marketplaces to modern megastores, retail evolution reflects broader economic and social changes. This trivia question focuses on a pivotal moment in retail development that fundamentally changed the shopping experience and created a new business model that still dominates today.

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Piggly Wiggly's self-service grocery store model
Sears Roebuck's mail-order catalog system
Woolworth's fixed-price merchandise concept
Marshall Field's department store with specialized sections