Abstract
The concept of equilibria is relevant to infrastructure plan-ning in helping us understand the nature of the problems. However, the perception of equilibria differs largely depending on the case, and thus, it may be far from consolidated. This article is to reconsider this with the specific reference to traffic assignments and land use. As for the economic market, the Walrasian equilibrium is theoretically important, but the applied general equilibrium (AGE) models have succeeded in identifying it numerically. As their construction may also be useful in the present context, we provide a brief introduction to the model and its solution procedure. In addition, we discuss three models on regional economies and/or interregional transactions, which have been developed under their influence.
