Which retail innovation, introduced in 1916, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance and is considered the precursor to modern supermarkets?

The modern retail landscape has evolved dramatically over centuries, with several pivotal innovations transforming how people shop. From the earliest department stores to today's e-commerce giants, retail history is filled with fascinating milestones that shaped consumer behavior and business strategies. Test your knowledge about a groundbreaking retail innovation that fundamentally changed the shopping experience and set the foundation for modern retail practices.

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Piggly Wiggly self-service store
Sears mail-order catalog system
Marshall Field's 'return policy' guarantee
F.W. Woolworth's five-and-dime pricing model