Which retail innovation, introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

The evolution of retail has been marked by significant innovations throughout history. Many of today's standard shopping experiences were once revolutionary concepts that dramatically changed how consumers interacted with products and retailers. This trivia question focuses on a pivotal development in retail history that transformed the shopping experience and set the foundation for modern commerce practices.

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Piggly Wiggly's self-service grocery store model
Woolworth's bargain basement department store
Sears Roebuck's mail-order catalog system
A&P's chain store standardization approach