A super network model for ideal formation and dynamic evolution of market chains was presented.For a supply chain economy with elastic demands,a variational inequality formulation of the equilibrium point was given,whose solution can be used to determine all the chain flows and link flows,the market demands,market prices,and market shares in the equilibrium. The existence and uniqueness of the equilibrium point were proved under reasonable conditions. The dynamic evolution of the market chains and their interchain competition can be modeled as a projected dynamical system.