Abstract
There have been many studies about the cost of so-called joint products for the long time, and stillit is very hard to determine the appropriate cost allotment to joint products. In the present study we deal with the problem from the viewpoint of macro economic consistency. Several new ideas such as qs-system, set cost, standard units will be introduced, and the Choquet integral with respect to fuzzy measures will be used to describe the present model, and to make an approach to the study about how to determine an appropriate cost assignments to joint products with set costs of composite commodities.
