Which company pioneered the first widespread modern loyalty program in 1981 that revolutionized how retailers tracked customer lifetime value?

Before digital apps and plastic cards, loyalty programs had humble beginnings in retail history. These programs transformed how businesses cultivated customer relationships and measured lifetime value. This question explores a pivotal moment in retail loyalty history that changed consumer behavior and marketing strategies forever.

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American Airlines with AAdvantage
Sears with the Sears Card
S&H Green Stamps
McDonald's with their Monopoly promotion