Economic effects of port project are evaluated by the amounts of values added which can be imputed to port. This paper discusses various kinds of values added and proposes a synthetic economic evaluation model for port planning.
　Values added generated by port can be classified into three categories and each of them can be estimated by different model. The first category is generated by
port investment. This effect can be calculated by usding input-output analysis. The second one is produced by the port service industries located in or nearby port. We can estimate this effect by the interrelation model between operating incomes and the amounts of handling goods or services associated with port. The third one is caused by the industries which depend upon seaborne cargos. This effect can be evaluated by the statiscal model which is composed of three submodels as follow; cargo flow model, interrelation model of goods and value added, and assignment model of value added among transportation facilities.
　Through an application to the Niigata Port (typical port in Japan), applicability to various scale of port, validity of result and flexibility to the cost of th
is model were certified.