交通投資の長期効果

ポテンシャル市場関連モデルによる便益分析

抄録

This paper intends to present a general equilibrium econometric model and to thereby measure the overall economic benefits from public transportation improvement by category-regional income and disposable time-and its distribution among regions. The characteristics of the model are that it is a dynamic simultaneous multiregional equilibrium open model in the sense that interregional transactions and migrations of final goods and productive factors are simultaneously decided in the respective inter-dependent regional markets, that the network of the economic distance is rigorously derived from the networks of time-distance and money-cost distance among regions basing upon the rational choice of transportation means by economic subjects and that the evaluation function is enlarged so as to incorporate disposable time and the contribution of the primary factors migration as well as the regional income. Thus the model enables to overcome the partialness of static and technoeconomic approaches. The main fact-findings are that the time-saving effect which would be neglected in the social economic accounting system counts 40% of the total benefit and that productive factors migrate in such a way as to equalize marginal productivities in all the regions.