Ever since the first consumer packaged goods product — Wrigley gum — was scanned in a Marsh supermarket 35 years ago, food retailers and their vendors have recognized the value of the voluminous sales data generated by scanning. Since then, retailers have made use of this treasure trove of detailed transaction data in a myriad of ways, from labor scheduling to store ordering. They've also sold it to syndicated data services like Information Resources Inc. and Nielsen Co., which in turn ...

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