Which retail innovation, first widely implemented in the 1930s, revolutionized grocery shopping by allowing customers to select their own products rather than having clerks retrieve items?

The food retail landscape has transformed dramatically over the past century. From neighborhood markets to modern supercenters, technological innovations have revolutionized how consumers purchase groceries. This poll tests your knowledge of a pivotal innovation that fundamentally changed the grocery shopping experience and set the stage for modern food retail. Can you identify which invention truly revolutionized the industry and created the foundation for today's shopping experience?

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Self-service shopping carts
Self-checkout kiosks
The supermarket model with self-service aisles
Refrigerated display cases