Loyalty Leap

Collecting data is easy for marketers. Figuring out what to do with it is hard.

Technology has made it almost routine for com­panies to know exactly when, where, and how their customers shop, both online and off. As soon as someone pulls out a credit card—or even better, a membership rewards card—the data floodgates open. United Airlines knows if you think it’s worth $25 to check a suitcase. Veriz...