日本金属学会誌

J. Japan Inst. Metals, Vol. 70, No. 6 (2006),
pp. 505-510

Waste Input-Output Material Flow Analysis and Its Application to Quantity Metals

Shinichiro Nakamura1 and Kenichi Nakajima2

1Graduate School of Economics, Waseda University, Tokyo 169-8050
2Graduate School of Environmental Science, Tohoku University, Sendai 980-8579

Abstract:

This paper develops a theoretical model of material flow analysis (MFA) within the framework of the Waste Input-Output model (WIO) (Nakamura and Kondo). The model is developed based on two fundamental ingredients: yield ratios and the degree of fabrication. In manufacturing process, multiplication of physical inputs by the yield ratios gives the portion that enters physical outputs, with the rest being discarded as process waste without entering outputs. In input-output analysis, the degree of fabrication can be visualized as triangularity of the input coefficients matrix (goods of lower degree of fabrication can enter those of higher fabrication, but the reverse does not hold), which is known to emerge through an appropriate reordering of sectors. Application to the Japanese IO data indicates that the model can provide accurate estimates of the weight as well as the composition of metals (Fe, Cu, Pb, Zn, and Al) used in a passenger car. The model is also used to estimate the major final use categories (household consumption, public consumption, capital investment, inventory investment, and export) of metals.


(Received 2006/3/9)

Keywords:

material flow analysys, waste input-output, material composition


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