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

The retail landscape we know today was shaped by revolutionary innovations throughout history. One of the most transformative shifts occurred in the early 20th century when a particular retail format emerged that fundamentally changed how people shopped. This innovation eliminated the need for clerk assistance for every purchase and dramatically increased the efficiency of the shopping experience. Test your knowledge of this pivotal moment in retail history that continues to influence store design and customer experience today.

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Piggly Wiggly self-service grocery store
Woolworth's department store catalog system
Marshall Field's bargain basement concept
A&P's 'economy store' model