Abstract
This study has proposed an economic valuation model to distinguish between the independent effect and the synergy effect of plural public works in the framework of conjoint analysis, and proposed a new method to allot the synergy effect to each project. From a case study on economic valuation of public works in the remoter mainly rural districts, the result indicates that there exist not only the positive value but also negative value of the synergy effect. When we pay attention to allotment of the synergy effect of each two project, it seems that the allotment ratio does not depend on the ratio of the independent effect of each project.
