When did retailers first begin widespread systematic collection and analysis of customer demographic data for targeted marketing?

In the evolution of retail strategy, understanding customer demographics has been crucial. But when did retailers first begin systematic collection and analysis of customer demographic data? This question explores a pivotal moment in retail history that changed how businesses understand their customers and transformed marketing approaches forever. Test your knowledge of this fundamental shift in retail strategy!

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1950s, with the rise of suburban shopping centers
1970s, with the introduction of electronic point-of-sale systems
1990s, with the emergence of e-commerce
1920s, with the advent of mass market advertising