Which retail innovation, launched in 1916, revolutionized shopping by introducing the first successful self-service grocery store model where customers could select their own products?

The early 20th century saw a fundamental shift in how consumers interacted with retail stores. Before this revolution, customers would hand their shopping lists to clerks who would fetch items from behind counters. A groundbreaking innovation changed this model forever, empowering shoppers to select their own merchandise and transforming the retail landscape. This innovation led to dramatic increases in efficiency, sales volumes, and ultimately paved the way for the modern supermarket experience we know today.

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Piggly Wiggly's 'self-shopping' system
A&P's 'economy store' format
Woolworth's 'five-and-dime' concept
Safeway's 'cash and carry' model