Which innovative retail concept was first introduced during the Great Depression (1929-1939) as a way to sell products more economically to struggling consumers?

During the economic hardship of the Great Depression, some of America's most enduring retail innovations emerged. Companies had to adapt to survive, creating new marketing strategies and products that would appeal to budget-conscious consumers. This historical period fundamentally transformed the retail landscape in ways that still influence shopping experiences today. Test your knowledge about a pivotal product innovation that emerged during this challenging economic era.

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Self-service supermarkets (where customers select their own items)
Mail-order catalogs with cash-on-delivery options
Department store credit cards
Door-to-door direct sales business model