| http://www.w3.org/ns/prov#value | - The method of claim 1, wherein said stock levels of products are represented by ##EQU6## where, M is a number of said retail locations in said production-distribution network,N0 is a number of products at a warehouse, Ni is a number of products at a retail location i, for i=1,2, . . . ,M, and sij is a shortage cost per unit for product j at said retail location i, i=1,2, . . . ,M and j=1,2, . . .
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