Which of these revolutionary retail concepts was first introduced during the Great Depression (1929-1939) as a direct response to changing consumer spending habits?

The Great Depression era wasn't just a time of economic hardship—it also sparked significant retail innovations that continue to influence shopping experiences today. As consumers tightened their belts, retailers had to adapt with new strategies to attract cautious shoppers. This poll explores a revolutionary retail concept born during this challenging historical period that fundamentally changed how Americans shop.

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Self-service supermarkets (where customers could select their own items without clerk assistance)
Department store loyalty cards (offering points for repeated purchases)
Seasonal clearance sales (offering discounts to make room for new inventory)
Mail-order catalogs (allowing rural customers to shop from home)