Book Review of The Aisles Have Eyes: How Retailers Track Your Shopping, Strip Your Privacy, and Define Your Power

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I have not yet seen the book but the author flogged it to Terry Gross (WHYY) 13 February 2017, 8 p.m., KPBS for about twenty minutes. He knows his apples and in his interview includes speculation about how much more retailers will know about us in a few short years.
As it is, I would think that few people know how closely they are starting to track shoppers. It has been previously reported that prices may be adjusted to obtain a sale from an unsure customer, but your cellphone may soon offer a 15% discount at a nearby competitor as you walk into a store to get a cuppa java.