The way McDonald's does this that they essentially offer discounts that you can only get by using the mobile app, and the mobile app can dynamically price your cart however they wish. All they (or any other business) has to do is to increase their non-mobile prices to squeeze out non-identifiable shopping.
replyThe store could make it mandatory to swipe your fidelity care before calculating your prices. They already do something similar with specialized promotions.
replyIf we're including promotions or membership discounts, then coupons fit this definition of price discrimination. And those have existed since the 90s at least.
replyThe problems show up when different people don't have access to the same coupons published by the store. Most coupons are fine.
replyThey haven't had the ability to do the significantly bad kinds of targeting until recently. This is a new problem even if it's similar to old practices at the surface level.