In recent years, supply chain and social network analysis have been handled as two independent fields within different organizations. Supply chain refers to the collaborative decision making between vertical and horizontal stakeholders in the subsequent value addition of products. The study on supply and value chains proposes the need for an efficient exchange of information and allocation of resources between the different levels of the network. On the other hand, social network analysis provides the possible connections, physical and virtual, between the various organizations involved in the chain. It is based on the identification of network structure constraints related to companies in a specific sector. Network analysis in the supply chain focuses on the need for various levels of social relationship between suppliers, manufacturers, warehouses, distributors, and retail outlets. Croom et al., 2000[1], emphasizes the importance of relationships in a supply chain network to achieve an efficient flow of information and resources. A supply chain lacks coordination if each stage only optimizes its own local objective, without considering the impact on the entire production process. chain. Total supply chain profits in an uncoordinated chain are therefore lower than those that could be achieved through coordination. Developing strong social connectivity and trust between members benefits the supply chain in terms of reducing uncertainty (Baker and Faulkner, 2004[2]). Social networking helps in coordination of various levels of the supply chain and sharing of resources. This leads to reduction in inventory costs, production costs, number of backorders, lead times, labor costs for shipping and receiving, and increases the level of product availability. Dyer, 2000[3] demonstrated that a higher level of social… middle of paper… with testing results and sensitivity analysis on the total cost function. We conclude the paper with Section 6 in which we summarize our findings and suggest future research areas in this area. 2) MULTI-PERIOD SUPPLY CHAIN NETWORK MODELING In this section we develop a well-connected N-level multi-period supply chain network. we consider a planning horizon of periods T (1,….t,….T). The model consists of number of resellers,... … ,n(N-1) suppliers of resellers, n(N-2) suppliers of suppliers and so on up to n1 number of primary suppliers (first tier suppliers). A typical primary supplier is denoted by i, a typical second-tier supplier is denoted by j and so on until a typical tier N retailer is denoted by l. The arrows represent the flow of materials from one level to another. The link from one time period to another represents the social level
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