Which retail innovation, first introduced in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise rather than requesting items from clerks?

The retail landscape has transformed dramatically over the decades, with innovations that forever changed how consumers shop. One particular retail innovation in the 20th century revolutionized the entire shopping experience and laid the foundation for modern retail concepts we take for granted today. Test your knowledge of this pivotal moment in retail history that fundamentally altered consumer behavior and business models across the industry.

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The self-service grocery store (Piggly Wiggly)
The department store credit card (Sears)
The shopping mall concept (Southdale Center)
The retail loyalty program (S&H Green Stamps)