the system of indicating the cost of a consumer product in terms of a standard unit of measure, as so much per pound, quart, or yard, in addition to the price per can, bottle, or piece.
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British Dictionary definitions for unit pricing
a system of pricing foodstuffs, etc, in which the cost of a single unit is shown to enable shoppers to see the advantage of buying multipacks
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012