MINNEAPOLIS — For food retailers, coupons on mobile phones present two problems: The cashier needs an image scanner to scan the 2-D coupon bar code — most grocers use laser scanners not suited for this purpose — and multiple coupons take too long to scan individually. Last year, Target here overcame both of those issues by employing image scanners at the checkouts in its 1,800 stores and by adopting a mobile coupon system from CodeBroker, Belmont, Mass., that creates a single bar code for ...

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