Which retail innovation did Piggly Wiggly introduce in 1916 that revolutionized shopping and became the standard model for modern supermarkets?

The history of retail has shaped economies and consumer culture for centuries. From humble general stores to massive retail empires, the evolution of shopping has reflected broader societal changes. This poll tests your knowledge about a pivotal moment in American retail history that transformed how we shop and set the foundation for modern retail giants.

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The self-service shopping model where customers could select their own merchandise
The first retail loyalty card program that offered discounts to repeat customers
The first chain store model with centralized purchasing and standardized storefronts
The introduction of installment payment plans for household goods