Which grocery innovation, introduced in 1916, is credited with creating the first true 'self-service' shopping model that revolutionized food retail and led to the modern supermarket concept?

The supermarket landscape has transformed dramatically over the decades, revolutionizing how we shop for food. Behind today's sophisticated food retail chains are fascinating stories of innovation and customer-centric strategies. This poll tests your knowledge about a pivotal moment in food retail history that changed how Americans shop for groceries. Do you know which pioneering concept transformed food shopping from a service-counter experience to the self-service model we recognize today?

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Piggly Wiggly's turnstile entrance and checkout counter system
A&P's introduction of private label food products
Kroger's implementation of refrigerated display cases
Safeway's shopping cart with folding basket design