Which retail innovation gained widespread popularity during the Great Depression as a consumer-friendly sales strategy that helped keep businesses afloat?

During the economic hardship of the Great Depression (1929-1939), American retail underwent significant transformations that would permanently change consumer behavior and shopping patterns. While many businesses failed, some retail innovations born from necessity became foundations of modern shopping experiences. This historical period offers fascinating insights into how economic pressure drives retail innovation and shifts brand strategies. Test your knowledge about this pivotal era in retail history!

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Self-service supermarkets (where customers selected their own items rather than asking clerks)
Mail-order catalogs (which were actually first popularized decades earlier by Sears and Montgomery Ward)
Department store credit cards (which wouldn't become widespread until the 1950s)
Online shopping portals (which wouldn't emerge until the rise of the internet in the late 20th century)