Which of these retail innovations was first introduced in the 1910s and revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Before e-commerce dominated the retail landscape, several revolutionary innovations transformed how people shopped throughout history. This trivia question explores a pivotal moment in retail history that fundamentally changed consumer behavior and set the stage for modern shopping experiences. Test your knowledge about the evolution of retail innovation and see if you can identify which breakthrough truly revolutionized the shopping experience in its era.

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The self-service grocery store (Piggly Wiggly)
The shopping cart (introduced by Sylvan Goldman)
The department store loyalty card program
The in-store barcode scanner system