Which retail innovation was first widely adopted during the Great Depression, revolutionizing supply chain efficiency and shopping habits?

During the economic hardships of the 1930s Great Depression, one retail innovation emerged that would permanently change American shopping habits and supply chain management. This revolutionary approach to retail was born from necessity during economic turmoil, yet became a cornerstone of modern commerce. Test your knowledge of how historical economic crises shaped retail evolution and consumer behavior.

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Self-service supermarkets (where customers select their own items)
Mail-order catalogs with cash-on-delivery options
Department store loyalty card programs
Installment payment plans for household goods