Which innovative retail concept, launched in 1916, revolutionized shopping by introducing self-service where customers could select their own merchandise without clerk assistance?

The retail landscape we know today wasn't always filled with self-service stores where customers could pick products themselves. For centuries, retail relied on clerk-service models where store employees retrieved products for customers. This poll explores a pivotal innovation in retail history that fundamentally changed how we shop and set the foundation for modern supermarkets and department stores.

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Piggly Wiggly (first true self-service grocery store)
Woolworth's Five and Dime (first discount department store)
Marshall Field's (first store with price tags)
Selfridge's (first store with window displays)