Which technological advancement in the 2010s revolutionized retail customer retention by enabling real-time personalized recommendations based on browsing behavior?

Customer retention has become increasingly sophisticated in the retail sector. As acquisition costs rise, companies invest more in keeping existing customers. From loyalty programs to personalized marketing, the strategies have evolved dramatically. This trivia question explores a key turning point in how retailers approach customer retention analytics. Test your knowledge of this important business economics concept!

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Big data analytics platforms that could process customer behavior patterns at scale
Introduction of NFC payment systems that tracked purchase history
QR code-based loyalty programs that gamified the shopping experience
Blockchain technology that secured customer loyalty points across multiple retailers