Of course, any shopper who wants in on these services needs to forfeit some privacy. I know what you re doing and where you are, says Accenture s Osman. And so far, retailers aren t offering huge deals in return for that scrutiny. At Best Buy, for example, Shopkick users can get 10 percent off smaller items like DVDs and video games, but bigger ticket electronics remain off limits. For now some consumers who are on board with the GPS movement have found that human error can still be a problem. Sandy Paben, a 50 year old tech executive in Cazenovia, N.Y., says she s been rejected twice by cashiers after presenting a coupon on her phone. The kids behind the counter had no idea how to use them, she says.
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