Which retail innovation from the 1930s is considered the precursor to modern personalized recommendation systems?

The landscape of retail has transformed dramatically throughout history, with certain innovations and marketing strategies changing how people shop forever. Some retail giants pioneered techniques that we now take for granted. This trivia question explores a significant moment in retail history that revolutionized the shopping experience and set standards for personalization that continue to influence modern e-commerce.

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Sears Roebuck's 'Personal Shopper' mail service that selected items based on previous purchases
Montgomery Ward's 'Style Preference Cards' used to track customer fashion choices
Woolworth's 'Customer Loyalty Program' that offered tailored discounts based on purchase history
Macy's 'Individual Taste Registry' that stored family preferences for home goods