Supply Chain Model with Deletion Mechanism

At present,the supply chain system gradually constitutes a complex network.Consequently,it can be well studied based on the complex network theory.The paper first analyzes the forming process and topology structure of the supply chain network.After that,considering the emergence,declining and withdrawal of the nodes in the real supply chain,a preferential attachment model is proposed to describe its evolutionary process.The results show that the model follows a power law degree distribution with degree exponent γ=3,which is in line with the empirical data.