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Re:Why Getting Paid for Your Data Is a Bad Deal by viraptor on Sunday November 22, 2020 @08:04PM (#25182586)
It's much easier to do that for hotels than for groceries since comparison is harder. It will be quite widely known and sightly abused if your grocery chain starts doing that. The shops will always have the reference price in public after all.

The pricing difference that actually matters (moving old stock) is already mostly done without personalised data. Sales are a standard.

Re:Why Getting Paid for Your Data Is a Bad Deal by grawprog on Sunday November 22, 2020 @08:12PM (#25182628)
For now, with brick and mortor businesses because it's hard to do that in a physical place. With people increasingly ordering things online it becomes easier and more profitable to do that.

If someone has your spending history, sees you buy something frequently, they have no incentive to put it on sale. Likewise, if they see something you've maybe looked at but not bought, they can put it in sale and tempt you.

This is just one example. I'm sure marketers can come up with all sorts.