Which of these revolutionary retail concepts was first introduced during the Great Depression era (1929-1939)?

The retail industry has undergone dramatic transformations throughout history, with certain innovations revolutionizing how consumers shop and interact with products. This poll tests your knowledge about a pivotal moment in retail history that fundamentally changed consumer behavior and set the stage for modern shopping experiences. Can you identify which groundbreaking retail concept first emerged during a specific historical period?

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Self-service supermarkets (where customers select their own items without clerk assistance)
Department store loyalty cards with reward points
Shopping malls with multiple retailers under one roof
Retail catalogs offering mail-order products