Following Takayama and Judge (1964a, 1964b), spatial equilibrium model has been used to find equilibrium situation effected as a necessary consequence of interactions among spatially (temporary or in transaction cost respect) separated persons such as producers, traders and consumers under some fixed market system including international trade, and the model has been applied to various empirical policy analyses. In the paper, I try to make clear the direction of development of spatial equilibrium model in recent years, reviewing our own related papers, and also I try to make clear the direction in the future. I demonstrate that spatial equilibrium model is an empirical model and the equilibrium condition of the model is usually specified only empirically as Non-linear Complementarity Problem (NCP). I also demonstrate that we need to introduce more concrete marketing route and economic risk into spatial equilibrium model to get more wide area of model application. In the future, I suggest, researchers will specify the model empirically as NCP (or similar mathmatical problem), taking more concrete marketing route and economic risk into consideration, and will solve the NCP directly to get useful infomation.
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