Which retail innovation from the early 20th century first enabled personalized customer tracking and is considered the historical foundation of modern retail personalization algorithms?

The history of retail has been marked by technological innovations and strategic shifts that fundamentally changed how businesses connect with consumers. This trivia question explores a pivotal moment in retail history that transformed product marketing and consumer engagement. Test your knowledge of how historical retail developments have shaped modern practices and strategies!

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The Piggly Wiggly self-service store model (1916)
Department store charge plates/cards (1920s)
Cash register receipt tracking (1906)
Radio advertisement audience metrics (1922)