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Re:What if people were paid for their data? by throwaway1982x on Monday July 23, 2018 @07:22PM (#17596863)
How much of this discount is for tracking, and how much is pure price discrimination?

The barrier of carrying a card allows the supermarket to give a discount to customers who are motivated by that, without needing to give the same discount to everyone.

The value of the tracking is probably irrelevant to how they set the price: it is not that loyalty card discounts have increased since tracking has become more valuable.

Re:What if people were paid for their data? by amelius on Tuesday July 24, 2018 @07:14AM (#17599914)
Yes, the loyalty card should be named "loyalty and tracking card", and we don't know how the discount is divided over both.