Which retail business model first gained widespread popularity during the Great Depression, offering consumers significantly lower prices by minimizing service and focusing on high volume?

During the economic devastation of the 1930s Great Depression, one retail innovation emerged that would forever change the way Americans shopped. While many businesses collapsed, a new retail model actually thrived during these challenging times. Test your knowledge about how retail history was shaped during one of America's darkest economic periods, and how consumer psychology shifted in response to widespread financial hardship.

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Supermarkets (replacing small grocery stores with larger self-service models)
Department stores (offering multiple product categories under one roof)
Mail-order catalogs (allowing rural customers to shop from home)
Convenience stores (offering extended hours and quick shopping)