ABSTRACT
In this chapter a three-layer supply network (depots, retailers and customers) is considered. The purposes are determination of proper locations of retailers and a suitable distribution of goods throughout the network minimizing cost of all tours. Supply chain (SC) is a complex of multi layers (supply units, production units and customers). Usually there are both upstream and downstream flow in this network. Information is sent by customer to the production units. Producers receive information and forward it to the suppliers where the raw materials are being provided. The raw materials are produced in production units and finally finished products are delivered to the customers. Managing these processes efficiently is called supply chain management (Beamon, 1998). Increasing population rate, requirements of food products increase, too.
