Material Stock and Flow Analysis and its Indicators in a Stock-type Society

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  • Tanikawa Hiroki
    Department of Environmental Engineering and Architecture, Graduate School of Environmental Studies, Nagoya University
  • Daigo Ichiro
    Department of Materials Engineering, The University of Tokyo
  • Oguchi Masahiro
    Fundamental Technology and Substance Management Section, Center for Material Cycles and Waste Management Reseach, National Institute of Environmental
  • Okuoka Keijiro
    Department of Environmental Engineering and Architecture, Graduate School of Environmental Studies, Nagoya University
  • Takagi Shigesada
    Environment and Energy Division, Mizuho Information & Research Institute, Inc.

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Other Title
  • 物質ストック・フローに着目したストック型社会構築に向けた指標
  • ブッシツ ストック ・ フロー ニ チャクモク シタ ストックガタ シャカイ コウチク ニ ムケタ シヒョウ

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Abstract

In order to establish a “stock-type” society as opposed to a “flow-type” society, the effects of resource consumption on the natural environment must be fully understood. The research fields of material flow and stock accounting offer systematic methods for that analysis. The material flow in Japan calculated by the Ministry of Environment covers inflow, outflow, and net addition of stock (NAS) however, it does not indicate the material stock which has been accumulated within the society. Material stock is closely related to services provided to society and the resource value recycled from output to demolish the stocks. This research focuses on the importance of material stock to achieve welfare, and aims to evaluate the time-series quantity of material stock for the sake of having knowledge and information that can clarify the material stock being accumulated in Japan. Classification of material stock is examined on the basis of structural objects, instruments and services. Then, in order to measure the actual mass of material stock by year, a method of statistical processing is established at a high level, which fits national census requirements. Additionally, the question of how to figure out material stock and flow is examined at a practical level. Finally, three indicators related to material stock are proposed for supporting material flow indicators.

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