In what decade did retailers first widely adopt formal demographic segmentation (targeting consumers by age, income, gender) as a systematic marketing strategy?

Today's retail market segmentation strategies weren't created overnight. This trivia question explores the historical development of how retailers began dividing consumers into distinct groups to better target their offerings. Test your knowledge about when retailers first began systematically implementing demographic segmentation as a formal marketing strategy!

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1930s, during the Great Depression when retailers needed to identify which customers still had purchasing power
1950s, alongside the post-WWII economic boom and the rise of suburban shopping centers
1970s, when computerization first allowed retailers to track customer data systematically
1990s, with the emergence of early e-commerce and digital marketing capabilities