Which historic loyalty program innovation from the 1890s is widely considered the first successful modern customer retention strategy and revolutionized retail marketing?

While loyalty programs may seem like a modern marketing strategy, they have a fascinating history dating back centuries. From trading stamps to punch cards to digital apps, retailers have long understood the value of customer retention. This trivia question explores a pivotal moment in loyalty program history that changed how businesses approached customer rewards and shaped today's sophisticated systems.

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S&H Green Stamps, where customers collected stamps with purchases to redeem for merchandise from catalogs
The Coca-Cola coupon system offering free glasses of Coke to potential customers
Montgomery Ward's 'Preferred Customer' membership cards offering exclusive store access
Sears Roebuck's 'Points Program' where rural customers earned credit toward future catalog orders