If you’ve ever walked into a store and instantly had the feeling like you’re being watched, it’s because you usually are. Between all-seeing security cameras and roving secret shoppers, retailers are busy keeping tabs on customers. Granted, brick-and-mortar stores have every right to be suspicious: inventory loss due to stealing takes a big chunk out of every retailer’s profits. But some customer-tracking techniques have nothing to do with shoplifting; it’s the customer’s shopping habits the businesses are interested in.

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