a system and method of determining price differences between price files which minimizes the possibility that an incorrect price is displayed by an electronic price label . the system includes a computer which reads the first and second price files , compares the prices for the items in the first and second files , and identifies predetermined items having different prices in the first and second files . the computer is preferably an epl computer . once a price discrepancy is identified , it may be logged and acted upon in accordance with rules established by an operator .