Which retail innovation, first introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

Before supermarkets and department stores dominated retail, shopping looked vastly different. This trivia explores a pivotal moment in retail history that revolutionized how consumers interacted with products and fundamentally changed shopping behavior. Test your knowledge about this transformative retail innovation that set the foundation for modern commerce as we know it today.

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The shopping mall (Southdale Center)
Self-service grocery store (Piggly Wiggly)
The department store (Bon Marché)
Mail-order catalog (Montgomery Ward)