A wireless checkout device being tested by Stop And Shop shows both the possibilities and problems involved with distributed checkout.

A wireless item-level checkout device being trialed by regional grocery chain Stop And Shop is demonstrating the potential -- and simultaneously the difficulties -- of distributed checkout.

The 389-store grocery chain -- employing about 59,000 in Massachusetts, Connecticut, Rhode Island, Maine, New Hampshire, New York and New Jersey -- has been running this trial since October at 90 of its stores in Massachusetts, Connecticut and Rhode Island.

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