Which retail innovation, first introduced in the 1930s, revolutionized shopping habits by allowing customers to select their own products without clerk assistance?

The evolution of retail has transformed how we shop over centuries. From ancient marketplaces to modern malls, retail history reveals fascinating innovations in customer experience. This trivia question explores a pivotal moment in retail history that fundamentally changed shopping habits and launched a revolution in how products were sold to consumers. Test your knowledge of this transformative period that set the foundation for today's retail landscape!

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Self-service grocery stores (pioneered by Piggly Wiggly)
Department store catalogs with mail-order delivery
Automated vending machines for consumer goods
Subscription-based product delivery services